The Quick Answer above is the generic definition. What follows is what is documented for the Volkswagen models that log P0137, checked against manufacturer data and owner reports.
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€45 - €310
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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 documented Volkswagen-specific patterns:
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 for P0137 in EUR, compiled across makes. Expect Volkswagen 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 Volkswagen
These codes commonly cluster with P0137 on Volkswagen vehicles:
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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