Powertrain
generic / SAE
P046E
EGR Sensor B Circuit Range/Performance
EGR sensor B reads in range but plausibility check fails — slow response or stuck reading. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 6E
Possible causes
- Sensor drift high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 60–500 €
- Estimated time: 0.5–2.5 h
- Component: egr valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012