P2042
Reductant Temperature Sensor A Circuit
P2042 is an OBD-II diagnostic trouble code meaning: Reductant Temperature Sensor A Circuit. Common causes: reagent temperature sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $28–89.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Increased NOx emissions
- SCR system error message on dashboard
Causes
- Reagent temperature sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in sensor connectors
- Wiring harness damage
- SCR control module malfunction
How to Fix
- Check the continuity of the temperature sensor circuit
- Check sensor connectors and contacts
- Check sensor resistance at different temperatures
- Replace reagent temperature sensor if necessary
- Check the operation of the SCR control module
Related codes
Error P2042 by Vehicle Brand
FAQ
What does the P2042 code mean?
P2042 is an OBD-II diagnostic trouble code that indicates: Reductant Temperature Sensor A Circuit
What causes a P2042 error code?
The most common causes of P2042 include: Reagent temperature sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in sensor connectors; Wiring harness damage.
How do I fix a P2042 diagnostic trouble code?
To fix P2042: Check the continuity of the temperature sensor circuit. Check sensor connectors and contacts. Check sensor resistance at different temperatures. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2042?
Yes, but get it checked soon
How much does it cost to fix P2042?
The estimated repair cost for P2042 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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