OBD-II code · Powertrain (generic, extended)
P241F EGR Cooler B Efficiency Below Threshold
The temperature drop across EGR cooler B is below the calibrated threshold - cooler is fouled with soot, has internal scaling, or coolant flow is restricted. Recirculated gas reaches the intake hotter than designed, increasing NOx and combustion temperatures.
Is it safe to drive with P241F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCooler fouled with soot or scaled
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–5 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Cooler B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.