OBD-II code · Powertrain (generic, extended)
P24C4 EGR Cooler Bypass Position Sensor Exceeded Learning Limit Bank 1
The bypass valve position sensor learning has reached its software-side limit on bank 1 - typically heavy soot deposits have shifted the mechanical zero beyond the design adaptation range.
Is it safe to drive with P24C4?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeavy carbon build-up on valve seat
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
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Cooler Bypass Position Sensor B1
Related codes
- P24C5EGR Cooler Bypass Position Sensor Exceeded Learning Limit Bank 2
- P24C1EVAP System Leak Detection Pump Switching Valve Performance Stuck Off
- P24C2Exhaust Gas Temperature Measurement System Multiple Sensor Correlation Bank 1
- P24C3Exhaust Gas Temperature Measurement System Multiple Sensor Correlation Bank 2
- P24C6Particulate Matter Sensor Temperature Circuit
- P24C7Particulate Matter Sensor Temperature Circuit Range or Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.