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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Linkage worn or slippingCommon
Parts involved
- Exhaust Bypass Valve B
P23A8 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.