BMW 2A87 means the exhaust cam was late or failed to reach its target. The factory SIB includes defined E83 N52K vehicles, while F25 N20/N55 and G01 engines use different hardware and often different code families. Verify oil/filter/pressure, graph exhaust target versus actual, test the correct solenoid/circuit and use VIN-specific recall and ISTA guidance before mechanical work.
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 the exhaust delay
Graph target/actual exhaust angle at the temperature that set the fault and compare intake under equal conditions.
Save newer 1303xx companions if the DME provides them.
Separate circuit from oil control
Load-test solenoid control and connector tension and observe real cam movement during ISTA activation.
Verify safe oil pressure and inspect contamination before assigning the actuator.
Use VIN-correct mechanical tests
Check recall status and follow the installed engine's bolt, passage, adjuster and sealing-ring path.
Confirm repeatable hot response without 2A87.
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
BMW X3 diagnostics span E83, F25 and G01 generations with N52 naturally aspirated six-cylinder, N20 four-cylinder turbo, N55 six-cylinder turbo, diesel and newer B-series engines. A four-digit E-series fault may not be the native code on a later DME. Confirm VIN, chassis, engine designation, production date and complete ISTA fault text before choosing VANOS, boost, fuel or cylinder tests.
- 2A87 is exhaust VANOS; 2A82 is intake.
- E83, F25 and G01 cam-control systems differ.
- Certain 2010–2011 X3 vehicles appear in recall 14V-176.
- Hot power reduction 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↗