Bank 1 sensor 2 heater fault on Audi TFSI — sensor wear or heat-damaged connector on longitudinal engines.
Audi P0036 — Bank 1 sensor 2 heater fault on Audi TFSI — sensor wear or heat-damaged connector on longitudinal engines. Typical UK independent garage cost: £110–£360.
What actually causes P0036 on a Audi
A4 B8 2.0 TFSI downstream sensor: heater element wears around 90k miles. 3.0 TFSI has two downstream sensors (one per bank via merged pipe); confirm bank ID before ordering.
Audi engines that log P0036
- 2.0 TFSI EA888 (A4, A5)
- 3.0 TFSI EA837 (S4, S5)
- 1.4 TFSI EA211 (A3)
How we diagnose P0036 on a Audi
- VCDS freeze frame and readiness status
- Confirm Bank 1 vs Bank 2 sensor 2 on V6 platforms
- Heater resistance 3–10Ω cold at sensor
- Bosch OE downstream sensor, readiness reset after fit
The common misdiagnosis to avoid
Assuming P0036 means cat replacement — it doesn't. Also, fitting a NTK sensor on 3.0 TFSI throws P0140 intermittent within weeks; Bosch OE only.
Audi P0036 repair cost in the UK
Expect £110–£360 including parts and labour at an independent garage. Main-dealer quotes on Audi are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.
Bob's workshop tip
A4 B8 2.0 TFSI — Bosch OE downstream at 90k+ miles is a fair-weather replacement. Don't buy cheap.
Codes usually seen alongside P0036 on Audi
- P0037
- P0141
- P0420
Symptoms drivers report with P0036
- Engine warning light within a mile of cold start
- No drivability issues
- Slight MPG drop
- Possible MOT emissions warning
- Code persists after clearing within one drive cycle
Repairs that clear P0036
- Replace sensor
- Inspect wiring
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0036 guide.
Reading P0036 on a Audi properly
A generic reader will show P0036 and nothing else. What matters is the freeze-frame data stored with it — engine speed, load, coolant temperature and fuel trims at the moment the fault was logged — plus whether any other module on the Audi has logged something at the same time. Codes rarely arrive alone, and the order they were stored in usually points at which one is the cause and which are the consequences.
Clearing P0036 without fixing it
Erasing the code resets the Audi's readiness monitors as well as the light. The fault returns on the next drive cycle if the cause is still there, and in the meantime the incomplete monitors can stop the car passing an emissions check. After a genuine repair, the car is driven until the relevant monitor completes before it is handed back.
Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P0036 is showing on your Audi, bring any scan results with you — we will read the live data ourselves, confirm which cause it actually is, and price the repair before any work starts.