P021C
Cylinder 9 Injection Timing
Generic injection timing fault on cylinder 9.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Injector response driftedCommon
Parts involved
- Injector Cyl9
P021C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.