OBD-II code · Powertrain (generic)
P04D2 EGR Temperature Sensor C Circuit Intermittent or Erratic
Same as P04CE with intermittent or erratic signal. 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 P04D2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntermittent contact at connector
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
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
- 0.6–1.6 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Temperature Sensor C, Egr Temperature Wiring C
Related codes
- P04E9EGR Temperature Sensor D Circuit Intermittent or Erratic
- P04CFEGR Temperature Sensor C Circuit Range or Performance
- P04D0EGR Temperature Sensor C Circuit Low
- P04D1EGR Temperature Sensor C Circuit High
- P04D3Exhaust Brake Input Circuit
- P04D4Exhaust Brake Input Circuit Range or Performance
- P04D5Exhaust Brake Input Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.