P1149 — 9 documented meanings by make

P1149 does not mean the same thing on every car — manufacturers reuse the number for different faults. 12 makes document it: Audi, Chrysler, Citroen, Ford, Honda, Mazda, Mercedes-Benz, Saab, SEAT, Skoda, SsangYong, Volkswagen. Find your make below.

P1149 on Audi, SEAT, Skoda, Volkswagen

On Audi, SEAT, Skoda, Volkswagen vehicles P1149 is documented as: Lambda control, bank 1, implausible control value. P1149 is stored when the ECU sees range or performance on oxygen sensor (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: Sensor reading is inside its electrical range but does not match reality; Contamination or deposits changing what the sensor sees; A mechanical fault upstream that the sensor is correctly reporting; Sensor drifted with age without failing outright.

Check first, cheapest first:

1. Compare the live value against a second sensor or a known-good figure — this code is about plausibility, not a dead circuit
2. Look for the mechanical cause first: leaks, restrictions or wear that would genuinely produce this reading
3. Clean the sensor if it is the type that fouls
4. Check freeze-frame data to see under what conditions it triggered
5. Replace the sensor only after the mechanical side is ruled out

Related Audi, SEAT, Skoda, Volkswagen codes:

P1149 on Chrysler

On Chrysler vehicles P1149 is documented as: Fuel injector group 2 supply voltage circuit. P1149 points at fuel injector. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Chrysler codes:

P1149 on Citroen

On Citroen vehicles P1149 is documented as: Variable timing solenoid. P1149 points at camshaft timing or VVT. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Citroen codes:

P1149 on Ford

On Ford vehicles P1149 is documented as: Closed loop control malfunction. P1149 is stored when the ECU sees malfunction on the circuit named in the code. 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:

1. Read all stored codes — a general fault code is often the symptom of a more specific one
2. Inspect the connector and wiring for the named component
3. Check supply and ground at the component
4. Measure the component against specification
5. Replace the component once wiring and supply are ruled out

Related Ford codes:

P1149 on Honda

On Honda vehicles P1149 is documented as: Primary heated oxygen sensor, sensor 1 circuit, implausible signal. P1149 is stored when the ECU sees range or performance on oxygen sensor (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: Sensor reading is inside its electrical range but does not match reality; Contamination or deposits changing what the sensor sees; A mechanical fault upstream that the sensor is correctly reporting; Sensor drifted with age without failing outright.

Check first, cheapest first:

1. Compare the live value against a second sensor or a known-good figure — this code is about plausibility, not a dead circuit
2. Look for the mechanical cause first: leaks, restrictions or wear that would genuinely produce this reading
3. Clean the sensor if it is the type that fouls
4. Check freeze-frame data to see under what conditions it triggered
5. Replace the sensor only after the mechanical side is ruled out

Related Honda codes:

P1149 on Mazda

On Mazda vehicles P1149 is documented as: Generator 2 monitor circuit high. P1149 is stored when the ECU sees signal too high on charging system. 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: Open ground for the sensor, letting the signal float up; Signal line shorted to a supply voltage; Sensor failed open, which the module reads as maximum; Connector fault interrupting the return path.

Check first, cheapest first:

1. Read the live value and compare with what the conditions should produce
2. Check the sensor ground continuity back to the module
3. Unplug the sensor: if the reading changes, the wiring is intact and the sensor is suspect
4. Inspect the connector for corrosion or a spread terminal
5. Replace the sensor once ground and signal wiring are confirmed good

Related Mazda codes:

P1149 on Mercedes-Benz

On Mercedes-Benz vehicles P1149 is documented as: Mass air-flow sensor circuit, bank 2.

Related Mercedes-Benz codes:

P1149 on Saab

On Saab vehicles P1149 is documented as: Injection timing control, injection too late. P1149 points at camshaft timing or VVT. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Saab codes:

P1149 on SsangYong

On SsangYong vehicles P1149 is documented as: Water in fuel filter.

Related SsangYong 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:

1. 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.
2. Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
3. Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
4. 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 P1149 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.