P1669
Fuel Injector 4 Mechanical Fault
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Unstable engine idling
- Power Loss
- Increased fuel consumption
- Misfire in cylinder 4
- Check Engine Light Is On
Causes
- Injector needle jamming
- Worn injector seals
- Nozzle contamination
- Mechanical damage to the injector
- Low fuel quality
How to Fix
- Check injector resistance
- Clean the nozzle with ultrasound
- Check the operation of the injector on the stand
- Replace the faulty injector
- Flush the fuel system