G3/1 (O2 Sensor Downstream TWC): Short Circuit to Positive [P0138] [Start Here]

[2] G3/1 (O2 Sensor Downstream TWC): Short Circuit to Positive [P0138]

Note on fault codes P2029 and P2046 in connection with the fault code P2038





If fault codes P2029 (P0171/P0172), P2038 (P0136/P0137/P0138) and P2046 (P0130/P0135) are present, the following steps must be carried out prior to component testing:

- Check line(s) of components G3/1 (O2 sensor downstream TWC) and G3/2 (O2 sensor upstream TWC) for incorrect routing and damage.
- Check connectors G3/1x1 (O2 sensor downstream TWC connector) and G3/2x1 (O2 sensor upstream of TWC connector) for proper seating, contacts and latching.

Question: Is the test o.k?

No
- The component is not o.k.
Remedy
- Repair or replace lines and connector in accordance with current circuit diagram.
**End of test**

Yes
- Test 1: Check actual value G3/1 (O2 sensor downstream TWC) Test 1: Check Actual Value G3/1 (O2 Sensor Downstream TWC)
- Test 2: Test of current consumption of O2 sensor heater of component G3/1 (O2 sensor downstream TWC) Test 2: Test of Current Consumption of O2 Sensor Heater of Component G3/1 (O2 Sensor Downstream TWC)