P00D6
HO2S Sensor Correlation Bank 2 Sensor 1/Bank 2 Sensor 2
Pre- and post-cat oxygen sensors on bank 2 do not correlate as expected — typical sign of catalyst inefficiency or one failed sensor.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Catalyst aged or contaminatedCommon
Parts involved
- Oxygen Sensor B2s1
- Oxygen Sensor B2s2
- Catalyst
P00D6 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.