Powertrain
generic / SAE
P0486
EGR Sensor B Circuit
A general electrical fault on EGR sensor B — second EGR sensor on dual-loop or HP/LP EGR systems. 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 / 86
Possible causes
- Sensor failed high
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: 80–500 €
- Estimated time: 0.5–2.5 h
- Component: egr valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012