P1152 — 10 documented meanings by make
Documented by: AUDI, BMW, CITROEN, FORD, JAGUAR, KIA, MAZDA, PEUGEOT, SEAT, SKODA, SUBARU, VOLKSWAGEN, VOLVO — the meaning can differ between manufacturers
P1152 does not mean the same thing on every car — manufacturers reuse the number for different faults. 13 makes document it: Audi, BMW, Citroen, Ford, Jaguar, Kia, Mazda, Peugeot, SEAT, Skoda, Subaru, Volkswagen, Volvo. Find your make below.
| Make | Documented meaning | Points at |
|---|---|---|
| Audi | Bank 1, mixture adaptation region 2, below lean limit | signal too low |
| SEAT | Bank 1, mixture adaptation region 2, below lean limit | signal too low |
| Skoda | Bank 1, mixture adaptation region 2, below lean limit | signal too low |
| Volkswagen | Bank 1, mixture adaptation region 2, below lean limit | signal too low |
| BMW | Oxygen sensor heater circuit, low voltage, bank 2 sensor 1 | oxygen sensor · signal too low |
| Citroen | Engine control unit internal fault | control module |
| Citroen | Throttle position sensor 1 correlation with throttle position sensor 2 | throttle body or pedal position · correlation |
| Citroen | Lack of heated oxygen sensor bank 2 sensor 1 switching, sensor indicated rich | oxygen sensor |
| Ford | Lack of heated oxygen sensor, 2/1 switches - sensor indicates rich | oxygen sensor |
| Jaguar | Lack of heated oxygen sensor, 2/1 switches - sensor indicates rich | oxygen sensor |
| Mazda | Lack of heated oxygen sensor, 2/1 switches - sensor indicates rich | oxygen sensor |
| Kia | Accelerator pedal position sensor, low voltage | accelerator pedal sensor · signal too low |
| Peugeot | Motorised throttle | |
| Peugeot | Engine control unit internal fault | control module |
| Subaru | Oxygen sensor, implausible signal low, bank 1 sensor 1 | oxygen sensor · signal too low |
| Volvo | Oxygen sensor front bank 2 | oxygen sensor |
P1152 on Audi, SEAT, Skoda, Volkswagen
On Audi, SEAT, Skoda, Volkswagen vehicles P1152 is documented as: Bank 1, mixture adaptation region 2, below lean limit. P1152 is stored when the ECU sees signal too low on the circuit named in the code (bank 1). That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: High resistance in the supply or ground path, dragging the signal down; Corroded connector adding resistance the module reads as a low reading; Sensor drifted out of tolerance with age; Partial short to ground somewhere in the signal line.
Check first, cheapest first:
- Read the live value on a scanner and compare with a known-good reading
- Clean and re-seat the connector, then re-test before replacing anything
- Check the ground point for that circuit — a poor ground causes this far more often than a bad sensor
- Measure the sensor against specification with the connector back-probed
- Replace the sensor only once the wiring and ground have been ruled out
Related Audi, SEAT, Skoda, Volkswagen codes:
P1152 on BMW
On BMW vehicles P1152 is documented as: Oxygen sensor heater circuit, low voltage, bank 2 sensor 1. P1152 is stored when the ECU sees signal too low on oxygen sensor (bank 2, sensor 1). That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: High resistance in the supply or ground path, dragging the signal down; Corroded connector adding resistance the module reads as a low reading; Sensor drifted out of tolerance with age; Partial short to ground somewhere in the signal line.
Check first, cheapest first:
- Read the live value on a scanner and compare with a known-good reading
- Clean and re-seat the connector, then re-test before replacing anything
- Check the ground point for that circuit — a poor ground causes this far more often than a bad sensor
- Measure the sensor against specification with the connector back-probed
- Replace the sensor only once the wiring and ground have been ruled out
Related BMW codes:
P1152 on Citroen
On Citroen vehicles P1152 is documented as: Engine control unit internal fault; Throttle position sensor 1 correlation with throttle position sensor 2; Lack of heated oxygen sensor bank 2 sensor 1 switching, sensor indicated rich. P1152 is stored when the ECU sees malfunction on control module. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: Wiring or connector fault in the circuit; Component failed electrically; Supply or ground problem feeding the circuit; Controlling module fault, though this is the least common of the four.
Check first, cheapest first:
- Read all stored codes — a general fault code is often the symptom of a more specific one
- Inspect the connector and wiring for the named component
- Check supply and ground at the component
- Measure the component against specification
- Replace the component once wiring and supply are ruled out
Related Citroen codes:
P1152 on Ford, Jaguar, Mazda
On Ford, Jaguar, Mazda vehicles P1152 is documented as: Lack of heated oxygen sensor, 2/1 switches - sensor indicates rich. P1152 points at oxygen sensor. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Usually one of: Sensor aged and slow to respond; Heater element failed inside the sensor; Wiring or connector fault at the sensor; Exhaust leak near the sensor drawing in air; Engine genuinely running rich or lean.
Check first, cheapest first:
- Read the sensor's live trace — a lazy or flat signal identifies an aged sensor without removing anything
- Check for exhaust leaks upstream of the sensor
- Inspect the connector, which sits in a hot and exposed place and corrodes
- Measure the heater resistance against specification
- Replace the sensor once the exhaust and wiring are ruled out
Related Ford, Jaguar, Mazda codes:
P1152 on Kia
On Kia vehicles P1152 is documented as: Accelerator pedal position sensor, low voltage. P1152 is stored when the ECU sees signal too low on accelerator pedal sensor. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: High resistance in the supply or ground path, dragging the signal down; Corroded connector adding resistance the module reads as a low reading; Sensor drifted out of tolerance with age; Partial short to ground somewhere in the signal line.
Check first, cheapest first:
- Read the live value on a scanner and compare with a known-good reading
- Clean and re-seat the connector, then re-test before replacing anything
- Check the ground point for that circuit — a poor ground causes this far more often than a bad sensor
- Measure the sensor against specification with the connector back-probed
- Replace the sensor only once the wiring and ground have been ruled out
Related Kia codes:
P1152 on Subaru
On Subaru vehicles P1152 is documented as: Oxygen sensor, implausible signal low, bank 1 sensor 1. P1152 is stored when the ECU sees signal too low on oxygen sensor (bank 1, sensor 1). That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: High resistance in the supply or ground path, dragging the signal down; Corroded connector adding resistance the module reads as a low reading; Sensor drifted out of tolerance with age; Partial short to ground somewhere in the signal line.
Check first, cheapest first:
- Read the live value on a scanner and compare with a known-good reading
- Clean and re-seat the connector, then re-test before replacing anything
- Check the ground point for that circuit — a poor ground causes this far more often than a bad sensor
- Measure the sensor against specification with the connector back-probed
- Replace the sensor only once the wiring and ground have been ruled out
Related Subaru codes:
P1152 on Volvo
On Volvo vehicles P1152 is documented as: Oxygen sensor front bank 2. P1152 points at oxygen sensor (bank 2, front). The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Usually one of: Sensor aged and slow to respond; Heater element failed inside the sensor; Wiring or connector fault at the sensor; Exhaust leak near the sensor drawing in air; Engine genuinely running rich or lean.
Check first, cheapest first:
- Read the sensor's live trace — a lazy or flat signal identifies an aged sensor without removing anything
- Check for exhaust leaks upstream of the sensor
- Inspect the connector, which sits in a hot and exposed place and corrodes
- Measure the heater resistance against specification
- Replace the sensor once the exhaust and wiring are ruled out
Related Volvo codes:
Which one is yours
A generic OBD reader gives you the number, not which of these meanings your manufacturer assigned to it. To get to the specific one:
- Use a brand-specific scanner — VCDS for VAG, INPA or ISTA for BMW, XENTRY for Mercedes, Forscan for Ford. It shows the manufacturer's own text rather than the generic one.
- Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
- Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
- If you have no brand scanner, tell me the make and model below and I will tell you which of these applies to your car.
Code family
P1xxx is manufacturer-specific code (VW/Audi, BMW, Mercedes, Toyota etc. have different meanings for the same code number).
Severity
Manufacturer-specific codes need a brand scanner (VCDS for VAG, INPA for BMW, STAR for Mercedes).
That is what holds for P1152 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
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Code breakdown
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
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