Error code P0038 is displayed and the check engine light is on - what does this mean?
DTC P0038 is triggered by the OBD/EOBD system when a problem is detected with the heater of lambda sensor 2 in bank 1. This fault code indicates that the heating circuit of the downstream oxygen sensor is consuming too much current or has a short circuit.
What can cause this error code?
- Defective lambda sensor 2 bank 1
- Short circuit in the heating circuit of the oxygen sensor
- Damaged cable to the lambda sensor
- Loose or corroded plug connections
- Faulty fuse in the lambda sensor heating circuit
- Faulty engine control unit (ECM/PCM)
- Overheating of the lambda sensor due to engine problems
What symptoms occur in parallel with fault code P0038?
- Check engine light: Permanent activation of the check engine light
- Increased fuel consumption: Poorer engine efficiency due to faulty mixture control
- Rough engine running: Noticeable vibrations, especially when idling
- Starting problems: Delayed starting when the engine is cold
- Exhaust problems: Increased emission values during the emissions test
- Power loss: Reduced engine power under load
How can the problem with error code P0038 be rectified?
- The repair requires a systematic diagnosis of the lambda sensor heater and its electrical connections.
- Replacement of the defective lambda sensor 2 bank 1 including sealing ring and professional installation with the correct tightening torque
- Repair or replacement of damaged cables in the oxygen sensor heating circuit by using heat-resistant cables
- Cleaning and treatment of corroded plug connections with contact spray and subsequent sealing
- Checking and replacing the relevant fuse in the fuse box and checking for causes of short circuits
- Diagnosis and repair of the engine control unit in the event of a defective ECM/PCM output for the lambda probe heater
- Repair of engine problems such as defective injectors or ignition problems that cause the sensor to overheat
FAQ - Frequently asked questions about DTC P0038
Can I continue driving with error code P0038?
Driving is possible in the short term, but trouble code P0038 should be rectified as soon as possible. The defective lambda sensor heater leads to increased fuel consumption and can damage the catalytic converter in the long term.
What does the repair of error code P0038 cost?
The cost of rectifying EOBD code P0038 is between 80-300 euros. A new lambda sensor costs 60-180 euros, plus 50-120 euros in labor costs. Additional repair costs may be incurred for cable problems.
How long does it take to repair fault code P0038?
It usually takes 1-2 hours to rectify DTC P0038. Replacing the lambda sensor itself takes around 30-45 minutes, diagnosis and any cable repairs may require additional time.
Can I repair fault code P0038 myself?
The repair is possible with the appropriate knowledge. However, replacing the lambda sensor requires special tools and experience in dealing with hot exhaust systems. If you are unsure, you should visit a specialist workshop.
How do I recognize a defective lambda sensor heater with code P0038?
Use a multimeter to measure the resistance of the heater (should be 2-14 ohms) and check the voltage at the connector. An OBD scanner can also display live data from the oxygen sensor.
Does fault code P0038 prevent the main inspection?
Yes, the active fault code P0038 prevents the vehicle from passing the emissions test. The check engine light and the faulty lambda probe heater must be repaired before the main inspection.
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