P1350 — 13 documented meanings by make

P1350 does not mean the same thing on every car — manufacturers reuse the number for different faults. 17 makes document it: Audi, BMW, Chevrolet (USA), Citroen, Ford, Lexus, Mazda, Mercedes-Benz, Opel / Vauxhall, Peugeot, Saab, SEAT, Skoda, Suzuki, Toyota, Volkswagen, Volvo. Find your make below.

P1350 on Audi, SEAT, Skoda, Volkswagen

On Audi, SEAT, Skoda, Volkswagen vehicles P1350 is documented as: Ignition output 3, open circuit. P1350 is stored when the ECU sees open circuit 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: Broken wire, most often at a flex point such as a door hinge or engine mount; Corroded or pushed-back terminal in the connector; Blown fuse on the supply side; Component failed with an internally open winding or element.

Check first, cheapest first:

1. Check the relevant fuse first — it is the cheapest thing that produces this code
2. Unplug and inspect both halves of the connector for corrosion and terminal fit
3. Continuity-test the wire end to end while flexing the loom by hand
4. Measure the component itself against its specification
5. Repair the break or replace the component, whichever the measurement points to

Related Audi, SEAT, Skoda, Volkswagen codes:

P1350 on BMW

On BMW vehicles P1350 is documented as: Misfire during start cylinder 5. P1350 points at engine misfire (cylinder 5). 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: Worn or fouled spark plugs; Failed ignition coil on that cylinder; Injector blocked or leaking; Loss of compression — worn valve or head gasket; Unmetered air leaking into the intake.

Check first, cheapest first:

1. Swap the coil with a neighbouring cylinder and see whether the misfire follows it — this identifies a coil fault in minutes and costs nothing
2. Pull the plug on that cylinder and read its condition
3. Swap the injector the same way if the misfire stayed put
4. Check for vacuum leaks around the intake
5. Compression-test the cylinder if the electrical and fuel sides are both good

Related BMW codes:

P1350 on Chevrolet (USA)

On Chevrolet (USA) vehicles P1350 is documented as: Ignition control system.

Related Chevrolet (USA) codes:

P1350 on Citroen, Peugeot

On Citroen, Peugeot vehicles P1350 is documented as: Fuel level sensor B intermittent/bypass line monitor/SID 801, pre-/post-heating relay circuit, short or open circuit, including pre-heating plugs. P1350 is stored when the ECU sees open circuit 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: Broken wire, most often at a flex point such as a door hinge or engine mount; Corroded or pushed-back terminal in the connector; Blown fuse on the supply side; Component failed with an internally open winding or element.

Check first, cheapest first:

1. Check the relevant fuse first — it is the cheapest thing that produces this code
2. Unplug and inspect both halves of the connector for corrosion and terminal fit
3. Continuity-test the wire end to end while flexing the loom by hand
4. Measure the component itself against its specification
5. Repair the break or replace the component, whichever the measurement points to

Related Citroen, Peugeot codes:

P1350 on Ford, Mazda

On Ford, Mazda vehicles P1350 is documented as: Fuel level sensor B circuit intermittent. P1350 is stored when the ECU sees intermittent fault 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: Connector that loses contact with vibration or temperature; Wire broken inside its insulation, making contact only sometimes; Corrosion that conducts until it gets wet or hot; Component failing only under load or at temperature.

Check first, cheapest first:

1. Wiggle-test the loom and connector with live data on screen — the fault has to be caught while it is happening
2. Check freeze-frame data for the conditions that trigger it (temperature, load, speed)
3. Inspect connectors for spread terminals and green corrosion
4. Where possible, monitor the circuit over a drive rather than at idle
5. Replace only the part you have actually seen misbehave

Related Ford, Mazda codes:

P1350 on Lexus

On Lexus vehicles P1350 is documented as: Variable valve timing/camshaft position sensor range/performance. P1350 is stored when the ECU sees range or performance on camshaft timing or VVT. 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 Lexus codes:

P1350 on Mercedes-Benz

On Mercedes-Benz vehicles P1350 is documented as: Measured air in HFM sensor unplausible compared to throttle flap.

Related Mercedes-Benz codes:

P1350 on Opel / Vauxhall

On Opel / Vauxhall vehicles P1350 is documented as: Switched system voltage, ignition ON, circuit; Ignition diagnostic module random cylinder no signal.

Related Opel / Vauxhall codes:

P1350 on Saab

On Saab vehicles P1350 is documented as: Ignition coil trig random cylinder, signal missing at CDM. P1350 points at ignition coil or spark circuit. 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:

P1350 on Suzuki

On Suzuki vehicles P1350 is documented as: Pre-/post-heater relay.

Related Suzuki codes:

P1350 on Toyota

On Toyota vehicles P1350 is documented as: Glow plug relay, open or short circuit to ground. P1350 is stored when the ECU sees short to ground 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 insulation chafed through where the loom passes a bracket or edge; Water or salt in a connector bridging the signal pin to the body; The component itself shorted internally; A harness pinched during earlier repair work.

Check first, cheapest first:

1. Unplug the component and re-read the code — if it changes, the fault is in the component, not the wiring
2. Inspect the loom where it passes metal edges, brackets and hinges
3. Open the connector and check for green corrosion or moisture
4. Measure resistance from the signal pin to a body ground; near-zero confirms the short
5. Repair the harness section, or replace the component if it shorted internally

Related Toyota codes:

P1350 on Volvo

On Volvo vehicles P1350 is documented as: Ignition coil 1 primary. P1350 points at ignition coil or spark circuit. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

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:

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 P1350 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.