Injector Circuit Low - Cylinder 9
The P0287 code means the vehicle's onboard diagnostic system has detected: Injector Circuit Low - Cylinder 9. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $700 (parts and labor)
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Common Symptoms
- Check Engine Light illuminated
- Cylinder 9 misfire
- Rough idle on V10/V12 engine
- Rich condition
Probable Causes (Ranked by Likelihood)
- Short to ground in cylinder 9 injector wiring Very High
- Internally shorted injector High
- Connector corrosion Moderate
- PCM driver shorted Low
Step-by-Step Diagnostic Procedure
-
Measure injector resistance.
-
Check for short to ground in wiring.
-
Inspect connector.
-
Compare to other injector resistance values.
Frequently Asked Questions
How do I access cylinder 9 on a V10?
On Ford V10 engines, cylinder 9 is on the passenger side near the rear. On mid-engine cars like the R8, access requires rear engine cover removal.
Is V10 injector wiring more complex?
V10 and V12 engines have longer wiring harnesses with more connections, increasing the potential for intermittent faults.
Are V10 injectors expensive?
Performance V10 injectors (Audi, Lamborghini) can cost $150-$300 each. Truck V10 injectors are typically $50-$100 each.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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