P2698
Exhaust Aftertreatment Fuel Injector A Performance
The 7th injector responds to commands but does not deliver expected fuel during regeneration. Coking on the nozzle or worn pressure regulation reduces flow.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
Common causes
Ordered by how often each turns out to be the cause.
- Coked nozzle restricts fuel deliveryCommon
- Fuel pressure to the dosing line out of tolerancePossible
Parts involved
- Hc Dosing Injector
- High Pressure Pump
P2698 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.