P1408
EGR Flow Out Of Self Test Range
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Check Engine Light Is On
- Unstable engine idling
- Reduced engine power
- Increased fuel consumption
- Detonation (engine knocking)
Causes
- Dirty or faulty EGR valve
- Problems with the EGR valve electrical circuit
- EGR valve position sensor malfunction
- Leaks in the EGR system
- Software error in the engine control unit
How to Fix
- Check the condition of the EGR valve for contamination
- Check the electrical circuit of the EGR valve
- Check EGR valve position sensor
- Scan the system for other related errors
- Clean or replace EGR valve if necessary