BMW 2A87 means the exhaust cam was late or failed to reach its VANOS target. On applicable E60 N52/N52K 528i cars, BMW's SIB directs oil-supply and ISTA testing; an F10 N20/N26 uses different hardware and often newer fault text. Verify oil/filter/pressure, graph exhaust target versus actual, test the proper solenoid/circuit, then inspect passages, adjuster, seals or recall-related hardware only when VIN and test evidence direct it.
Match the symptom
Select the closest observation. The result changes the first test; it does not name a part to replace.
Check oil supply and correlation promptly.
What can set 2A87—and how to separate it
The order below is evidence-driven, not a universal probability ranking. Vehicle year, repair history, companion codes and the operating condition in freeze frame change where diagnosis should begin.
| Possible cause | Evidence that supports it | First useful test |
|---|---|---|
| Low, wrong or degraded engine oil | Level/specification and CVVT response are abnormal | Oil and filter audit |
| Affected cam oil-control valve or circuit | Command/current or loaded circuit fails | GDS/KDS actuation and circuit test |
| Restricted oil passage or sticking CVVT phaser | Safe pressure but commanded response fails | Hydraulic response test |
| Timing chain, tensioner or cam indexing fault | Stable phase offset, noise or mechanical evidence | Cam/crank waveform and timing inspection |
| Cam sensor/reluctor or ECM-input problem | Dropout, noise or companion circuit code | Signal and correlation test |
Capture exhaust-cam behavior
Graph target and actual exhaust angle at the temperature that caused the fault. Compare intake only under equal conditions.
Save occurrence count and newer 1303xx companions if the DME provides them.
Separate electrical from hydraulic delay
Load-test solenoid control and connector tension and watch physical cam response during ISTA activation.
Verify safe oil pressure and inspect contamination; debris can signal more than a failed solenoid.
Use VIN-correct mechanical guidance
Check current recall status and follow the installed engine's bolt, adjuster, passage and sealing-ring tests.
Confirm hot response and no returning 2A87 after repair.
Save these scan-data clues
Freeze frame is a snapshot of conditions when the PCM matured the fault. It can distinguish an idle-only problem from a load, cold-start or monitor-completion problem. Clearing first throws that context away.
- Exact VIN, platform, model year and engine sales code
- All confirmed, pending and permanent companion codes
- RPM, load, coolant temperature and vehicle speed
- Relevant commanded and actual scan data
- Recent service, repairs and symptom conditions
- Manufacturer bulletin and current software/VIN status
A practical diagnostic workflow
- 01Identify engine and intake/exhaust cam
Engine families and CVVT coverage differ.
- 02Save desired/actual angles and companions
Record temperature, rpm, load and oil history.
- 03Verify oil, filter and mechanical pressure
Do not command CVVT with unsafe lubrication.
- 04Test the correct oil-control valve and circuit
Separate electrical command from hydraulic movement.
- 05Scope cam against crank
Distinguish dropout from a stable phase error.
- 06Inspect phaser and timing only as evidence directs
Avoid sensor or chain replacement by guess.
- 07Perform applicable learning and verify
Confirm commanded tracking and no pending code.
Do not replace the most commonly named component from 2A87 alone. Confirm the exact engine, preserve evidence and complete the manufacturer test sequence before ordering parts.
Why the model year changes the test
The 528i badge spans E39, E60 and F10 generations. North American E60 cars generally use naturally aspirated N52 six-cylinder engines, while 2012–2016 F10 cars use turbocharged N20/N26 four-cylinders; the 2011 F10 used an inline-six. VANOS faults, boost codes, cylinder numbering, fuel pressure and crankcase ventilation therefore change by year. Decode VIN and read the engine/DME plus full ISTA text before applying a four-digit code definition.
- 2A87 is exhaust VANOS; 2A82 is intake.
- E60 and F10 cam-control systems are not interchangeable.
- Certain 2011 528i vehicles appear in recall 14V-176, but VIN lookup controls.
- Hot reduced power should be captured without repeated hard driving.
2A87 FAQ
Does the code prove the oil-control valve failed?+
No. Oil supply, wiring, passages, phaser, chain and feedback faults can produce it.
Can low oil cause it?+
Yes. CVVT depends on controlled engine-oil flow.
Can I drive?+
Limit driving and stop for rattle, oil warning, stalling or severe running problems.
Should I replace cam sensors?+
Not without waveform or circuit evidence.
Why check P0017?+
It can show that the exhaust cam is no longer correctly correlated with the crankshaft.
Does it prove the chain stretched?+
No. A stable measured offset and mechanical checks must support that conclusion.
Can cleaning the solenoid fix it?+
Only when contamination is confirmed and the approved service method permits it; the oil-system cause still matters.
What confirms repair?+
Desired and actual cam timing track correctly with no pending DTC.
Ford diagnostic references
These documents explain Ford monitor operation. Exact pinpoint tests, connector views and specifications must be selected for the truck's VIN and model year in current service information.
01BMW SIB 11 02 08 — 2A82/2A87 VANOS faultsIncludes defined E60/E61 N52/N52K and E83 N52K groups and distinguishes older four-digit from newer VANOS fault families↗02NHTSA acknowledgement — BMW Recall 14V-176Names certain 2011 528i and 2010–2011 X3 applications for VANOS housing bolts; VIN lookup determines applicability↗03BMW Technical Information SystemOfficial VIN-, engine- and ISTA test-plan information↗04BMW owner's manualsOfficial VIN/model operating, warning and maintenance information↗