BMW VANOS Solenoid Failure and 2A82 / 2A87 Faults

#2A82, 2A87 and P0011/P0014: what the codes mean

Your DME commanded a camshaft angle. The cam sensor reported the cam never got there, or got there too slowly. That's the whole fault. BMW's text for 2A82 is intake VANOS stiff or jammed mechanically, and 2A87 is the same complaint on the exhaust side. Codes 130108 and 130308 read as control fault, position not reached.

The word "mechanically" sends people straight to a parts catalog. Don't go there yet. VANOS is hydraulic: engine oil does the work, and a small electric solenoid valve only decides where that oil goes. BMW's service bulletin on these codes, SIB 11 02 08, attributes the faults to an insufficient oil pressure supply to the VANOS adjustment unit.

A generic OBD-II scanner won't show you 2A82 at all. It maps BMW's fault text onto the nearest SAE P-code, which is why half the forum threads about this problem are titled P0011. The P-code tells you which cam is off and in which direction. It doesn't tell you why.

Bank 1 codes are all you'll see on an inline-six. On a V8 or V10, P0021, P0022, P0024 and P0025 repeat the same four faults on bank 2. The pairing above is the usual mapping, not a guarantee: the P-code is a translation of BMW's fault, so read the BMW code with a BMW-capable tool before you buy anything. Our BMW check engine light guide covers what generic readers hide.

P0011 also shows up on a stretched timing chain, and the two look different once you log them. An oil-supply restriction gives you a deviation that comes and goes with oil temperature and load, and often clears on the next start. Chain stretch gives you a consistent offset at every rpm, usually with crank-to-cam correlation codes stored alongside it. On an N20 or N26 that's the distinction that matters, and our guide on BMW N20/N26 timing chain failure walks through it.

So treat a 2A82 as an oil-supply complaint until proven otherwise. The restriction might be inside the solenoid, or it might be a clogged screen upstream, dirty oil, a missing oil filter cap insert, or a worn seal bleeding pressure off before it reaches the phaser. Those parts run from about $40 to several thousand dollars.

VANOS is variable valve timing. It rotates a camshaft relative to its drive sprocket to change when the valves open, not how far. Every version since 1992 works the same way: oil pressure moves the mechanism, a solenoid meters the oil, the DME watches the cam sensor and corrects.

Two kinds of hardware, and they fail differently

Helical-splined piston type. Single VANOS on M50TU, M52, S50 and S52. Double VANOS on M52TU, M54, M56, S54 and S62, plus intake-only VANOS on each bank of the M62TU V8. Oil pressure pushes an axial piston, and helical splines turn that push into cam rotation. These come off the engine and get rebuilt with seals. They fail by seal deterioration and gear wear, and they're the engines that make a genuine VANOS rattle.

Vane-type cam phaser. N51, N52, N52K, N53, N54, N55, S55, N20, N26 and the B38/B48/B58 family. A vaned rotor sits in a housing bolted to the timing sprocket, and oil fed to one side of the vanes or the other rotates the cam. These get replaced, not rebuilt. On several of them the four aluminum bolts holding the housing together are their own failure mode: when the heads loosen or break, the unit leaks internally.

#Which symptom points to which part (N52, N54, E46 M3)

The classic presentation is a car that runs fine cold, then throws a light and goes soft after a while at full operating temperature. BMW's bulletin describes exactly that: the situation can occur after driving for some time at full operating temperature, and if the ignition is cycled the engine then usually performs normally.

That self-clearing behavior is why owners put it off. It's also the cheapest point to catch it. A light that clears itself points to a restriction that hasn't done damage yet. A hard fault that never clears is more likely to have something mechanical behind it.

Power loss concentrates low in the rev range. Below roughly 3,000 rpm the engine feels flat; higher up it feels close to normal. Add a rougher idle, hesitation on tip-in, sometimes a bog and then a surge near 3,000 rpm, and worse fuel economy. On an N54, charge-pressure faults ride along, because the DME won't build boost with cam timing out of range.

Documented VANOS rattle belongs to the piston-type units and shows up in an rpm band or at warm idle. The M62TU V8 is the one engine where a cold-start VANOS rattle is documented. If the noise is on an N20 or N26, read our guide on BMW N20/N26 timing chain failure first.

VANOS or Valvetronic? Read the code, not the symptom

These two get mixed up often. Valvetronic is variable valve lift, intake side only. An electric servomotor turns a worm gear that rotates an eccentric shaft through roughly five-eighths of a turn, and that shaft repositions intermediate levers between the camshaft and the valves. Because lift meters the air, the engine doesn't need its throttle plate in normal running.

Valvetronic is mechanically and electrically actuated. It doesn't use oil pressure to position anything. VANOS and Valvetronic are separate systems that happen to live in the same corner of the engine and produce overlapping complaints. You tell them apart by the fault text, not by how the car feels.

When Valvetronic fails, the DME commands maximum lift and hands metering back to the throttle plate: long cranking, poor cold running, reduced power. The fault text names the servomotor or the eccentric shaft sensor, for example 135808, Valvetronic servomotor position sensors, electrical. VANOS fault text names camshaft position, position not reached, camshaft jammed, or stiff. On a Valvetronic engine, also check the eccentric shaft sensor connector. Oil wicking into the plug is a known failure.

And if the car is an N53, N54, S54, S62, S65, S85, M54 or M62TU, there's no Valvetronic on it to fail. If you've been quoted a Valvetronic motor on one of those engines, ask what part is meant, because the engine doesn't have one.

#Is it safe to drive with a VANOS fault?

We can't tell you it's safe without seeing the car, and the answer depends on what it's doing. A light that comes on and clears itself means get it looked at soon rather than driving it that way for another year. Reduced power on every drive means go straight in, keep the trip short and stay off the highway. A new metallic noise, a stall, or a no-start after shutdown on a vane-type engine means have it towed, because those are the symptoms BMW's own recall filing describes when the phaser housing bolts let go. If power drops while you're driving, pull over somewhere safe.

BMW's description, filed with NHTSA for recall 23V-707, is that because camshaft position is monitored by the engine electronics, a deviation from target is recognized and reduced-engine-power limp-home mode is activated. The driver gets a check engine light plus a check control message, either immediately or at the next startup.

BMW's Part 573 filing with NHTSA for 23V-707 states that in very rare cases the engine could stall during operation, which could lead to a crash. NHTSA's recall summary names stalling as the safety risk. BMW's chronology also reports no accidents or injuries related to the issue. We haven't found a published failure rate for VANOS solenoids, so any percentage you read online isn't coming from BMW.

Waiting is where the cost can climb. A restricted solenoid is about a one-hour job. If the oil-supply problem behind it keeps going, it can wear the camshaft hook ring seals into the bearing ledge. That's an 8 to 14 hour job, or a cylinder head on the intake side of an N52 or N55.

Contamination travels, too. Worn aluminum phaser sprockets shed material into the same oil circuit that feeds the solenoids, the tensioner and the bearings. It can run the other way as well: bearing material from a failing engine circulates through that same VANOS circuit and can set these codes. VANOS codes on an engine with a known bearing problem are a symptom, not the disease, and on an S65 our guide on BMW S65 rod bearing failure is the one to read first.

You'll read that a sheared phaser bolt causes valve-to-piston contact. Owners report it both ways, including people who sheared bolts and found no bent valves, and BMW's own defect description stops at internal leakage, limp mode and stall. Treat valve damage as worth avoiding, not a certainty.

#VANOS solenoid replacement cost: N52, N54, S54, S62

These are planning estimates for an independent European specialist, parts plus labor, with parts at current retail. Diagnosis is its own line, and the repair ranges don't include it. Members save 5 to 15 percent on labor depending on tier, and 10 percent on parts, so member totals land under these. They're estimates, not quotes. You get a written quote before any work starts.

Two other things move the number. Cylinder count, because a V8 or V10 has twice the solenoids and phasers and far worse access. And overlapping work: a valve cover gasket, an oil filter housing gasket or a chain tensioner often share labor with this job. If your car is already leaking, our guides on a BMW valve cover gasket leak and a BMW oil filter housing gasket leak explain those, and doing them together saves labor.

#How a VANOS fault gets diagnosed properly

This is a guided diagnosis, not a code read. A generic scanner converts BMW's fault text into a nearest-equivalent P-code and hides both the real description and the factory test plan. We start with the bulletin's three steps: run the ISTA test plans, check the oil filter cap insert, then replace both solenoids with an oil and filter change. The checks below are ours, added on top of that.

1. 01
   Read the real faults and run the test planISTA gives you BMW's own fault text and the guided plan, plus whatever else is stored: charge-pressure faults on an N54, misfires, crank-to-cam correlation codes. That changes where you look next.
2. 02
   Check oil level and condition firstThe system is oil-pressure actuated. Low, overdue, fuel-diluted or varnished oil sets these codes with nothing mechanically wrong. Black and thin oil gets corrected before anything else.
3. 03
   Check the oil filter housing cap insertBMW's service information says that if the insert was left out at the last oil service, unfiltered oil reaches the engine and can clog or damage the solenoids, and the whole cap then has to be replaced. The same document describes that damage as not a defect in materials or workmanship, so it may not be covered under warranty. It takes about a minute to check.
4. 04
   Swap and bench-test the solenoidsSwap intake for exhaust, clear, re-run. If the fault follows the solenoid, that's your answer; if it stays put, it isn't. Then bench them on 12 volts (off the car, brief contact only, away from fuel and oil vapor): the spool should stroke cleanly and return, and alive but sluggish is still failed. Check the mesh screen while it's out. We don't chase a resistance figure, because we haven't found a BMW-published figure for these part numbers and the values online contradict each other.
5. 05
   Inspect the upstream non-return valvesOn N51, N52 and N54 two stacked oil non-return valves sit in the head ahead of the solenoids, each with its own screen. A clogged screen sets the same fault as a bad solenoid. They clean but don't disassemble, and the upper one can seize, so it goes on the estimate as a possible extra, not a surprise.
6. 06
   Log commanded against actual cam angleWatch cam position against target at warm idle and through a load sweep, and read the shape of the trace, not a number. A smooth line tracking target is healthy; a sawtooth or a channel that won't converge points at the hydraulic circuit. Chain stretch looks different, as a consistent offset across all conditions. We haven't found a published factory table of normal values, so forum numbers aren't a diagnosis.
7. 07
   Gauge the oil pressure if codes outlive the easy fixesCodes that survive new solenoids, clean check valves and fresh oil are an oil-pressure problem. Measure it mechanically instead of buying another part. This means hot oil under pressure. It's a shop test.
8. 08
   Pull the valve cover and lookOn vane-type engines, check whether the four housing bolts on either adjuster have backed out or sheared, and inspect the camshaft bearing ledge for grooves cut by the hook ring seals. On 2010-2013 inline-sixes, check the VIN for open recalls first.

#Cleaning solenoids versus replacing them

Cleaning is a fair diagnostic step and sometimes a lasting repair, but it isn't what BMW instructs. The bulletin says replace both VANOS solenoids, change the engine oil and filter, and reset the service data. Both, not one: whatever contaminated the failed solenoid has been through the other.

What cleaning means in practice: pull the solenoid, look at the fine mesh screen under good light, soak the body in parts cleaner until the screen is clear, blow it dry with low-pressure air, then power it on the bench and watch the spool stroke and return. A pass is a clean screen, a spool that moves crisply every time, and a coil that's neither open nor shorted. A fail is a screen that stays packed, a spool that hangs at all, or varnish you can still see in the bore. New O-ring either way.

So cleaning is defensible when the coil is electrically sound, the screen is lightly varnished rather than packed solid, and the owner knows it's a trial. It isn't when the spool sticks under bench activation, when the coil is faulty, or when the engine is visibly sludged. There's no controlled data on how long a cleaned solenoid lasts against a new one, and shop experience genuinely splits. If the condition supports it, it goes on the paperwork as a trial.

The S54 splits differently. There the documented common failure is cracked solder joints at the coil pack connector pins, a vibration problem rather than a contamination one, and the fix is a replacement coil pack. Sticking valve pistons from sludge on the same engine are cleanable.

#What the repair involves and how long it takes

There's no single VANOS job. There are about seven, and which one you need depends on what the diagnosis finds. That's why prices for this repair vary so much online. In round hours: solenoids about one, a piston-type rebuild about four, a camshaft bearing ledge 8 to 14.

The top two rows are external work at the front of the cylinder head. No timing tools, no cam locking. Everything below that line means locked camshafts or the VANOS unit off the engine, and the hours climb accordingly.

Piston-type units can be rebuilt, which keeps the cost down. The original piston seal O-rings are nitrile, and nitrile hardens and shrinks in engine conditions until it stops sealing. Nitrile is generally good to roughly 100-120°C continuous, while Viton (FKM) is rated to about 200°C, which is why the seal kits use it. If the unit is already off, do the rattle repair at the same time: half an hour more now against a second teardown later. The rattle fix we use isn't new helical gears alone, which wear over time. It's a reduced-height piston bearing ring, shimmed to take out the axial play.

Know how the bearing ledge job works before you need one. On N51, N52, N53, N54 and early N55 engines the front of each camshaft is itself an oil passage feeding the phaser, sealed by rectangular hook ring seals riding in the camshaft bearing ledge. The seals deteriorate and cut grooves into the ledge, and oil bypasses instead of pressurizing the phaser. BMW's repair information for this job shows worn versus acceptable ledges and is explicit both ways: don't replace the camshafts, replace only the ledge and hook rings on the affected side, and leave unworn parts alone.

#Keeping it from coming back

Oil change interval matters more than anything else here. VANOS is an oil-pressure actuator with fine screens in front of it, and it doesn't care what the service indicator says. Condition Based Service can stretch to 10,000-15,000 miles, and BMW's Longlife oil specs are designed for those longer intervals. BMW's repair instruction pairs new solenoids with an oil and filter change. A 5,000 to 7,500 mile or annual interval is what we recommend on these engines. That's the consensus among BMW specialists and follows from BMW's repair procedure, but it isn't a published BMW recommendation.

• Use the right specification, not just the right weight. LL-01 or LL-01 FE on most of these engines, LL-17 FE+ or LL-22 FE++ on recent B-series, 10W-60 on S54, S62, S65 and S85.
• Check that the oil filter housing cap insert is in place at every oil change. If it's missing, unfiltered oil can damage the solenoids, and BMW's service information indicates it may not treat that as a warranty defect.
• Use a genuine or OE filter. The cage and anti-drainback function are part of the design, and VANOS depends on oil still being in the head at startup.
• On N51, N52 and N54, treat the two cylinder-head non-return valves as maintenance at about $40 each. Cheapest insurance against the codes returning.
• If you fit an aftermarket billet oil filter housing cap, confirm first that it retains the correct insert and cage function, since a missing insert is one of the causes BMW names for solenoid damage.
• If you have a 2010-2013 BMW inline-six, enter the VIN at nhtsa.gov/recalls. If an open VANOS bolt recall shows up, a BMW dealer does that repair at no charge.
• Fix oil leaks and low level promptly, and address a tensioner that bleeds down overnight. The same loss of oil retention means the phasers start dry.

#Replacing VANOS solenoids yourself (N51, N52, N54)

On an N-series six, many owners can replace the solenoids themselves: remove the trim, unplug the connector, pull the retaining fastener, withdraw the solenoid, fit a new O-ring, reinstall, clear adaptations. Work on a cold engine with the battery disconnected, and wipe up any oil on the belt drive before you start it. New solenoids won't fix a clogged screen or a worn bearing ledge, so if the codes come back, those are the next things to check. Parts you supply yourself aren't covered by our warranty.

Parts reference

VANOS solenoid (N51, N52, N52K, N54, per SIB 11 02 08)

11 36 7 585 425, two per engine, replaced as a pair. On an N55, confirm the part number by VIN in ETK before ordering, because BMW catalogs more than one VANOS solenoid.

Oil non-return valve, cylinder head

11367541692, two per engine, stacked, each screened

Camshaft hook ring seal (Rectangring)

11317587757, updated to a one-piece Teflon design

Updated VANOS housing bolt

11368602263, the updated screw fitted in place of the original aluminum bolts

Oil filter housing cap

11427525334, replace the whole cap if the internal insert is missing

Engine oil

A BMW Longlife-01-approved oil in the viscosity your owner's manual lists. SIB 11 02 08 calls for an oil and filter change (filter 11 42 7 566 327) but doesn't name an oil grade.

Piston-type VANOS removal

Needs camshaft locking tools and BMW's timing procedure for your exact engine. Getting cam timing wrong can bend valves. This isn't a job to do from a parts list.

After any VANOS repair

Fresh oil and filter, clear adaptations, road test to full operating temperature

Before ordering

These numbers were current as of September 2026, and BMW supersedes part numbers over time. Confirm by VIN with a parts counter before you buy.

We run ISTA on these cars at our shop in Melissa, TX. The scan and the 49-point inspection are free. Deeper VANOS diagnosis, like oil-pressure testing or pulling the valve cover, gets quoted before we do it. After the repair we re-scan and road test the car long enough to reach full operating temperature, because a drive around the block doesn't prove a VANOS repair. Repairs we perform carry a 24-month / 24,000-mile parts and labor warranty, whichever comes first. See our terms for what's covered.