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P0136 on Audi: Causes, Symptoms and Fix Cost

Quick Answer

Safe to drive (short-term)

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.

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 P0136 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.

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What does P0136 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 P0136.

Audi A4

2006-2024

On the B7 and B8 A4 with the 2.0 TFSI (EA113 in the B7, EA888 in the B8), oil consumption on some EA888 engines can contaminate the downstream sensor, so check how much oil the engine uses before replacing it. Access on the longitudinal A4 is from underneath and tighter than on a transverse Golf.

What causes P0136 on a Audi?

Beyond the generic causes listed on the main P0136 page, these are the patterns noted for Audi models:

  • Oil consumption on the EA888 2.0 TFSI contaminating the sensor

    : Audi A4

  • Connector not fully reseated after work in a tight spot

    : Audi A4

How to diagnose P0136 on a Audi with OBD2

  1. Read freeze frame data to capture the engine conditions when the code was set (RPM, coolant temp, load)
  2. Inspect the exhaust system between the catalytic converter and the downstream sensor for cracks, loose clamps, or gasket leaks
  3. Inspect the Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, or chafing against the heat shield
  4. 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
  5. 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.

Repair Parts Cost Labor Cost Total Estimate DIY Difficulty
Replace downstream O2 sensor (Bank 1, Sensor 2) €40–€180 €50–€130 €90–€310 Moderate
Repair O2 sensor wiring or connector €5–€25 €40–€120 €45–€145 Moderate
Fix exhaust leak near downstream sensor €15–€90 €60–€200 €75–€290 Moderate

Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.

These codes are often seen alongside P0136 or point to related issues, on any make:

Looking for the full P0136 reference (all makes, full diagnosis flow, complete repair cost matrix)? See the main P0136 guide

Diagnose P0136 on your Audi

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