EGR B Flow Excessive Detected
Same as P049A but with measured flow above the required rate - typically EGR valve sticking open or position sensor offset low.
Affected components
- Egr valve b
- Egr position sensor b
Common causes
- High likelihood: EGR valve B sticking open
- Medium likelihood: Position sensor reads low
Possible symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.