P0137 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Safe to drive (short-term)
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. VW, Audi, Skoda and SEAT apps often show this code as P013700; the last two digits are a failure-type byte.
- Severity
- Moderate · Emissions
- Typical repair cost, all makes
- €45-€310
Connect a standard OBD2 adapter (Bluetooth LE on iPhone) to your Audi and Skanyx tells you what P0137 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
Get Skanyx freeWhat does P0137 mean on a Audi?
The Quick Answer above is the generic definition. What follows is the model-specific detail for the Audi models that log P0137.
Audi A4
2006-2024
On the B7 and B8 A4 2.0 TFSI (EA113 in the B7, EA888 in the B8), oil consumption on some EA888 engines can contaminate the downstream sensor over time, so check oil use before condemning the sensor. The downstream connector sits in a tight spot and is easy to leave half-seated after other work.
What causes P0137 on a Audi?
Beyond the generic causes listed on the main P0137 page, these are the patterns noted for Audi models:
Oil contamination of the sensor on the EA888 2.0 TFSI
: Audi A4
Connector not fully reseated after work in a tight spot
: Audi A4
How to diagnose P0137 on a Audi with OBD2
- 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.
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Replace downstream O2 sensor (Bank 1, Sensor 2) | €40–€180 | €50–€130 | €90–€310 | Moderate |
| Fix exhaust leak near downstream sensor | €15–€90 | €60–€200 | €75–€290 | Moderate |
| Repair O2 sensor wiring or connector | €5–€25 | €40–€120 | €45–€145 | Moderate |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
Codes related to P0137
These codes are often seen alongside P0137 or point to related issues, on any make:
Looking for the full P0137 reference (all makes, full diagnosis flow, complete repair cost matrix)? See the main P0137 guide