OBD-II code · Powertrain (generic)
P042E EGR A Control Stuck Open
EGR A Control Stuck Open: the control module has detected this fault condition. Without valid EGR feedback the ECU disables exhaust gas recirculation and may set further EGR codes.
Is it safe to drive with P042E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCarbon buildup holds valve open
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
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
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Valve
Related codes
- P045EEGR B Control Stuck Open
- P23E5EGR C Control Stuck Open
- P042BCatalyst Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 2)
- P042CCatalyst Temperature Sensor Circuit Low (Bank 1 Sensor 2)
- P042DCatalyst Temperature Sensor Circuit High (Bank 1 Sensor 2)
- P042FEGR A Control Stuck Closed
- P0430Catalyst System Efficiency Below Threshold (Bank 2)
- P0431Warm Up Catalyst Efficiency Below Threshold (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.