OBD-II code · Powertrain (generic, extended)
P23A8 Exhaust Heat Exchanger Bypass Valve B Position Sensor Stop Performance
During calibration the position sensor of bypass valve B does not reach one of its mechanical end stops as expected.
Is it safe to drive with P23A8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLinkage worn or slipping
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Exhaust Bypass Valve B
Related codes
- P23A5Exhaust Heat Exchanger Bypass Valve B Control Performance
- P23A6Exhaust Heat Exchanger Bypass Valve B Stuck Open
- P23A7Exhaust Heat Exchanger Bypass Valve B Stuck Closed
- P23A9Communication Fault Forced Engine Shutdown
- P23AATurbocharger Bypass Valve A Stuck
- P23ABNOx Sensor Processor Performance Bank 1 Sensor 3
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.