OBD-II code · Powertrain (generic)
P041D EGR Temperature Sensor B Circuit High
EGR temperature sensor B above upper plausibility — open signal or short to B+. 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 P041D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen signal line
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Temperature Sensor
Related codes
- P040DEGR Temperature Sensor A Circuit High
- P041AEGR Temperature Sensor B Circuit
- P04D1EGR Temperature Sensor C Circuit High
- P04E8EGR Temperature Sensor D Circuit High
- P041BEGR Temperature Sensor B Circuit Range/Performance
- P041CEGR Temperature Sensor B Circuit Low
- P041EEGR Temperature Sensor B Circuit Intermittent/Erratic
- P041FSecondary Air Injection System Switching Valve A Circuit Low
- P0420Catalyst System Efficiency Below Threshold (Bank 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.