The Quick Answer above is the generic definition. What follows is what is documented for the Volkswagen models that log P0140, checked against manufacturer data and owner reports.
DTC/P0140·Volkswagen
P0140 on Volkswagen: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Volkswagen
P0140 on a Volkswagen means the ECU cannot detect any activity from the downstream oxygen sensor on Bank 1 (post-catalyst, Sensor 2). The sensor voltage is either flatlined or out of range. This usually points to a failed sensor, an open circuit in the wiring, or a connector that has come loose or corroded.
Repair cost on Volkswagen€1 - €310
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Volkswagen Golf
2005–2024EA888 TSI engines see P0140 most often from heater element burnout combined with oil-contaminated sensor element. Check the heater fuse first, then heater resistance at the sensor before buying parts. On older MK5/MK6 cars, the sensor harness can chafe against the heat shield, breaking the signal wire and producing P0140.
What causes P0140 on a Volkswagen?
Beyond the generic causes listed on the main P0140 page, these are the documented Volkswagen-specific patterns:
Volkswagen GolfHeater element burnout accelerated by EA888 oil consumption
Volkswagen GolfWire chafing against heat shield on MK5/MK6 chassis
How to diagnose P0140 on a Volkswagen with OBD2
Follow these steps to pinpoint the root cause of P0140:
- Read freeze frame data and check for companion heater codes (P0141, P0155) that would point to a power issue at the sensor
- Inspect the Bank 1 Sensor 2 connector visually for disconnection, corrosion, water intrusion, or melted plastic
- Use a multimeter at the sensor connector to verify ground, heater power (battery voltage with key on), and signal continuity back to the ECU
- If wiring tests good, unplug the sensor and measure heater resistance directly. Healthy: 2–15 ohms. Open: burned-out heater. The sensor needs replacement
- If a new sensor still shows no activity, scope the signal wire for opens or shorts between the sensor and ECU
How much does P0140 cost to fix on a Volkswagen? (EUR)
Estimated repair costs for P0140 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 P0140 on Volkswagen
These codes commonly cluster with P0140 on Volkswagen vehicles:
Looking for the full P0140 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0140 guideSkanyx · Volkswagen
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