P0137 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.
DTC/P0137·Volkswagen
P0137 on Volkswagen: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Volkswagen
P0137 on a Volkswagen 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 Volkswagen€52 - €357
What does P0137 mean on a Volkswagen?
Volkswagen Golf
2005–2024EA888 TSI engines commonly throw P0137 from oil contamination on the sensor element rather than true sensor failure. Check oil consumption before replacing the sensor on any TSI with over 100,000 km. On TDI models, P0137 is rare because the downstream lambda sensor is supplemented by NOx and PM sensors that catch issues earlier.
What causes P0137 on a Volkswagen?
Beyond the generic causes listed on the main P0137 page, these are the Volkswagen-specific patterns we see most often:
Volkswagen GolfEA888 oil consumption contaminating sensor and shifting baseline voltage
Volkswagen GolfBosch sensor element aging on TSI at 90,000+ km
How to diagnose P0137 on a Volkswagen 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 Volkswagen? (EUR)
Estimated repair costs on a Volkswagen (Volkswagen parts and labour typically run 15% above the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0137 on Volkswagen
These codes commonly cluster with P0137 on Volkswagen vehicles:
FAQ: P0137 on Volkswagen
Can I drive with P0137?
Yes, for short distances. The downstream sensor does not directly control fuel injection, so the car will run normally. Long term, the low signal often masks a developing exhaust leak or converter issue that should be addressed.
Can an exhaust leak cause P0137?
Yes. Even a small leak between the catalytic converter and the downstream sensor lets fresh air reach the sensor, which it reads as a lean exhaust and reports as low voltage. Check for cracked welds, loose clamps, and worn gaskets before replacing the sensor.
Will a bad O2 sensor damage the catalytic converter?
Not the downstream sensor by itself. P0137 alone does not change fuel mixture significantly. But if the underlying cause is a real lean condition or a failing upstream sensor, that can damage the converter over time.
How much does it cost to fix P0137 in Europe?
Replacing the downstream sensor at an independent garage typically costs 100–250 euros total. Dealership pricing runs 200–400 euros, mostly due to OEM-branded sensors versus identical Bosch or NTK aftermarket units.
Looking for the full P0137 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0137 guideSkanyx · Volkswagen
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