P046BCatalyst Temperature Sensor 1/2 Correlation Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Some engines measure the catalyst temperature with sensors instead of only modelling it. P046B compares catalyst temperature sensors 1 and 2 of bank 2 (the side without cylinder 1): both are electrically valid, but their readings do not match – for example they differ after a long stop, or the difference does not fit the operating state. No manufacturer document available to us uses this code; FCA's EcoDiesel has only one such sensor per bank, and most makers handle exhaust temperature sensors and their correlation under EGT codes such as P0544 ff or P24C2. The description follows CARB's plausibility requirement for input components.
- What you may notice
- Check engine light on
- Usually no change in driving
- Diesel: filter regeneration possibly changed
- Likely causes
- LikelyOne of the two sensors drifting (soot on the tip, ageing)
- PossibleSensors fitted or connected the wrong way round
- PossibleContact resistance at one sensor's connector
- RareExhaust leak between the sensors
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.