OBD-II code · Powertrain (generic, extended)
P248F EGR Cooler Bypass Control Circuit Range or Performance Bank 2
Same as P245B on bank 2. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
Is it safe to drive with P248F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBypass valve sticking due to soot
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
- Often, with basic tools
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Cooler Bypass Valve B2
Related codes
- P245BEGR Cooler Bypass Control Circuit Range or Performance Bank 1
- P248CReductant Heater B Sense Circuit Low
- P248DReductant Heater B Sense Circuit High
- P248EEGR Cooler Bypass Control Circuit Open Bank 2
- P2490EGR Cooler Bypass Control Circuit Low Bank 2
- P2491EGR Cooler Bypass Control Circuit High Bank 2
- P2492EGR Cooler Bypass Position Sensor Circuit Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.