P1110–P1134 O2 Sensor Heater Circuit, Bank 2-Sensor 2: Short to B+
A wire in this circuit is touching a live positive feed, so the part sees power when it shouldn't.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P1110 | O2 Sensor Heater Circuit, Bank 2-Sensor 2: Short to B+ | Investigate soon |
P1132 | O2 Sensor Heater Circuit, Bank 1+2 Sensor 1 - Short to B+ | Investigate soon |
P1134 | O2 Sensor Heater Circuit, Bank 1+2 Sensor 2 - Short to B+ | Investigate soon |
The definition
P1110: O2 Sensor Heater Circuit, Bank 2-Sensor 2: Short to B+.
P1110 is a manufacturer-specific powertrain code (the engine or gearbox). Its meaning is set by the carmaker rather than by the SAE standard, so a generic OBD-II reader will often show it as an unknown code or misread it.
What to check first
Cheapest and fastest checks first:
- With the connector unplugged and ignition on, check whether the signal pin already has battery voltage on it. It should not.
- Check for a chafed wire lying against a live feed, especially in looms that run alongside the starter or alternator cabling.
What actually causes this on a VAG
Bank 2 is the cylinder bank that does not contain cylinder 1, so this code only applies to engines that have two banks - in the VAG range that means the V6, V8 and W engines, plus the VR-type engines that split their exhaust into two banks with a lambda sensor on each. An ordinary four-cylinder has one bank and won't use this code. Sensor 2 is the lambda sensor after the catalytic converter, and its main job is checking that the cat is working rather than doing the primary fuelling control. Each sensor carries a built-in heater so it reaches operating temperature quickly, and the ECU has flagged that heater's circuit as sitting at battery voltage when it shouldn't be. The car usually drives perfectly normally, but this is an emissions fault and the engine warning light will normally stay on - which is a problem in itself when the car goes for its MOT.
Most likely causes, in order
- Melted or chafed sensor lead. Post-cat sensor leads run along the underbody close to hot exhaust and heat shields, and a lead that has slipped onto the exhaust or a loose heat shield rubbing against it is the usual culprit. Follow the lead from the sensor all the way to its connector and look for scorch marks, hardened insulation or bare wire before touching anything else.
- Corroded connector under the car. These plugs sit right in the road spray and take salt and water all winter, and damp bridging between pins produces exactly this kind of fault. Unplug it and look for green or crusty pins, then clean and protect it rather than immediately replacing the sensor.
- Loom disturbed by recent exhaust work. If this appeared soon after a cat, DPF, exhaust or gearbox job, suspect a trapped, stretched or wrongly routed sensor lead before anything electrical. It's a very common consequence of the sensor being unplugged and refitted.
- Failed heater inside the sensor. The heater element inside a lambda sensor does eventually burn out, and a genuinely dead heater needs a sensor. Worth knowing before you buy one: with no load left on the circuit the ECU can see the line sitting high, so an open heater element can sometimes be logged as a short to positive - which is another reason to prove the wiring and connector first and condemn the sensor second.
Worth knowing: Make sure it really is bank 2 - the bank without cylinder 1 - before buying a sensor. Lead lengths and connector positions differ between the two sides, so the part for the other bank often won't route properly even when it looks the same. And check the lead first: on a post-cat sensor the damage is far more often outside the sensor than inside it.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does P1110 mean?
P1110 means O2 Sensor Heater Circuit, Bank 2-Sensor 2: Short to B+. A wire in this circuit is touching a live positive feed, so the part sees power when it shouldn't.
Can I drive with P1110?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.