What are the common causes of P0287?

A weak or clogged cylinder 9 fuel injector. Low compression in cylinder 9. A worn piston ring or cylinder bore in cylinder 9. Low fuel pressure affecting all cylinders. A faulty fuel pressure regulator.

Run an injector balance test and compare cylinder 9 to the others. Do a compression and leak down test on cylinder 9. Check fuel pressure at the rail. Inspect the cylinder 9 injector O-rings for leaks. Replace injector 9 if it is weak or clogged. Clear the code and retest.

P0287

Cylinder 9 Contribution/Balance

System: Injector circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P0287 means Cylinder 9 Contribution/Balance.

Check these first

A weak or clogged cylinder 9 fuel injector
Low compression in cylinder 9
A worn piston ring or cylinder bore in cylinder 9
Low fuel pressure affecting all cylinders
A faulty fuel pressure regulator

What to do next

Run an injector balance test and compare cylinder 9 to the others
Do a compression and leak down test on cylinder 9
Check fuel pressure at the rail
Inspect the cylinder 9 injector O-rings for leaks
Replace injector 9 if it is weak or clogged
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.