U041BInvalid Data Received From Exhaust Gas Sensor Module A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- U041B names exhaust gas sensor module A, an electronic unit that heats and evaluates an exhaust probe, usually a wide-band oxygen sensor, and sends the result as bus data. The engine controller sets the code when the module still talks but its values fail plausibility, carry wrong counters or report the sensor as not ready. No manufacturer documents U041B publicly. Chrysler shows such a module on the Cummins 6.7 L in 2010-2012 Ram heavy-duty pickups: bulletin 25-002-14 lists its lost-communication code U011A among oxygen sensor faults and fits an overlay harness to the module before parts are replaced. CARB requires digital inputs of emission controls to be checked for out-of-range and rationality faults. Expect the MIL and closed-loop or aftertreatment functions held back. U046E is module B.
- What you may notice
- Check engine light
- Higher fuel use or regeneration problems on diesels
- Likely causes
- PossibleHeat-damaged sensor harness or connector at the sensor module
- PossibleAged or contaminated probe giving implausible readings
- RareExhaust gas sensor module internally faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.