P026D
Fuel Injection Quantity A Higher Than Expected
Fuel injection quantity A is higher than commanded — often a leaking injector or stuck-open nozzle.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Injector leaking or stuck openCommon
Parts involved
- Fuel Injectors
P026D 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.