The Quick Answer above is the generic definition. What follows is what is documented for the Audi models that log P0137, checked against manufacturer data and owner reports.
DTC/P0137·Audi
P0137 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P0137 on a Audi means the downstream oxygen sensor on Bank 1 (post-catalyst, Sensor 2) is reporting a voltage that stays too low for too long. This typically indicates a lean exhaust condition reaching the sensor, an exhaust leak ahead of the sensor, or a failed sensor stuck at low voltage. The downstream sensor should read a relatively steady 0.6–0.8V when the catalytic converter is working properly.
Repair cost on Audi€45 - €310
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Audi A4
2006–2024The B7 and B8 A4 with 2.0 TFSI shares the EA113/EA888 oil consumption issue plus carbon buildup on the intake valves. Both contaminate the downstream sensor over time. Walnut blast the intake before condemning the sensor on any TFSI over 80,000 km. The downstream connector lives in a tight spot near the gearbox bellhousing.
What causes P0137 on a Audi?
Beyond the generic causes listed on the main P0137 page, these are the documented Audi-specific patterns:
Audi A4Carbon buildup on 2.0 TFSI affecting combustion stability and sensor signal
Audi A4Connector access difficulty leading to incomplete reseating after work
How to diagnose P0137 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P0137:
- Read freeze frame data and check for any companion codes (P0420, P0171, P0174) that suggest a lean condition or converter problem
- Inspect the exhaust system between the catalytic converter and the downstream sensor for cracks, loose clamps, or leaking gaskets
- Inspect the Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, or chafing
- Use a scan tool to view downstream sensor voltage. A healthy sensor reads around 0.6–0.8V steady. A reading stuck below 0.2V points to sensor failure or an exhaust leak
- Substitute a known-good sensor or swap with the Bank 2 downstream sensor if equipped. If the low voltage follows the sensor, the sensor is faulty
How much does P0137 cost to fix on a Audi? (EUR)
Estimated repair costs for P0137 in EUR, compiled across makes. Expect Audi parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0137 on Audi
These codes commonly cluster with P0137 on Audi vehicles:
Looking for the full P0137 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0137 guideSkanyx · Audi
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