P1679 — 8 documented meanings by make

P1679 does not mean the same thing on every car — manufacturers reuse the number for different faults. 11 makes document it: Audi, Ford, Honda, Land & Range Rover, Mazda, Opel / Vauxhall, Saab, SEAT, Skoda, SsangYong, Volkswagen. Find your make below.

P1679 on Audi, SEAT, Skoda, Volkswagen

On Audi, SEAT, Skoda, Volkswagen vehicles P1679 is documented as: Electric throttle control fault light, K132, open circuit. P1679 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:

P1679 on Ford, Mazda

On Ford, Mazda vehicles P1679 is documented as: Engine oil pressure output circuit. P1679 points at oil pressure or level. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Ford, Mazda codes:

P1679 on Honda

On Honda vehicles P1679 is documented as: RSCD signal circuit.

Related Honda codes:

P1679 on Land & Range Rover

On Land & Range Rover vehicles P1679 is documented as: Demand pedal potentiometer 2 supply, implausible signal/condition. P1679 is stored when the ECU sees range or performance 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: 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 Land & Range Rover codes:

P1679 on Opel / Vauxhall

On Opel / Vauxhall vehicles P1679 is documented as: Body control module, BCM, wrong environment identifier; Too long operation of engine in compressed natural gas mode. P1679 points at control module. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related Opel / Vauxhall codes:

P1679 on Saab

On Saab vehicles P1679 is documented as: CIM or I BUS ECU's not added. P1679 is stored when the ECU sees not configured 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: Replacement module fitted but never coded to the car; Configuration lost after a battery or software event; Wrong part number for this vehicle specification; Adaptation or learning procedure not carried out after a repair.

Check first, cheapest first:

1. This is a coding fault, not a broken part — do not replace anything yet
2. Confirm the fitted module part number matches the vehicle specification
3. Run the coding or adaptation procedure with equipment that supports this brand
4. Re-check for the code after the adaptation completes

Related Saab codes:

P1679 on SsangYong

On SsangYong vehicles P1679 is documented as: Glow plug controller, short circuit.

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 P1679 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.