The Quick Answer above is the generic definition. What follows is what is documented for the Audi models that log P0136, checked against manufacturer data and owner reports.
DTC/P0136·Audi
P0136 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P0136 on a Audi means the downstream oxygen sensor on Bank 1 (post-catalyst, Sensor 2) is producing a voltage signal outside the expected operating range. This sensor monitors how well the catalytic converter is cleaning exhaust gases. A failing sensor or a degrading converter can both trigger this code.
Repair cost on Audi€45 - €310
Connect any standard Bluetooth OBD2 adapter to your Audi and Skanyx tells you what P0136 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 P0136 mean on a Audi?
Audi A4
2006–2024On the B7 and B8 A4 with the 2.0 TFSI (EA113 and EA888), carbon buildup on the intake valves causes inconsistent combustion, which the downstream sensor reports as drift. Walnut blast the intake before condemning the sensor on any TFSI over 80,000 km. The connector lives near the gearbox bellhousing and is awkward to reach from above.
What causes P0136 on a Audi?
Beyond the generic causes listed on the main P0136 page, these are the documented Audi-specific patterns:
Audi A4Carbon buildup on 2.0 TFSI intake valves causing combustion drift
Audi A4Connector access difficulty leading to incomplete repairs
How to diagnose P0136 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P0136:
- Read freeze frame data to capture the engine conditions when the code was set (RPM, coolant temp, load)
- Inspect the exhaust system between the catalytic converter and the downstream sensor for cracks, loose clamps, or gasket leaks
- Inspect the Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, or chafing against the heat shield
- Use a scan tool to view live O2 sensor data. The downstream sensor should show a relatively flat voltage around 0.6–0.8V at operating temperature, not the rapid switching of the upstream sensor
- Compare upstream vs downstream waveforms. If both switch identically, the converter is likely failing. If the downstream is erratic or stuck, replace the sensor
How much does P0136 cost to fix on a Audi? (EUR)
Estimated repair costs for P0136 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 P0136 on Audi
These codes commonly cluster with P0136 on Audi vehicles:
Looking for the full P0136 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0136 guideSkanyx · Audi
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