P1454 — 6 documented meanings by make

P1454 does not mean the same thing on every car — manufacturers reuse the number for different faults. 11 makes document it: Audi, BMW, Citroen, Ford, Honda, Jaguar, Mazda, Peugeot, SEAT, Skoda, Volkswagen. Find your make below.

P1454 on Audi, SEAT, Skoda, Volkswagen

On Audi, SEAT, Skoda, Volkswagen vehicles P1454 is documented as: Exhaust gas temperature sensor 1, short circuit to ground. P1454 is stored when the ECU sees short to ground on the circuit named in the code (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: 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 Audi, SEAT, Skoda, Volkswagen codes:

P1454 on BMW

On BMW vehicles P1454 is documented as: Secondary air injection pump with series resistor control circuit electrical. P1454 points at secondary air injection. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.

Related BMW codes:

P1454 on Citroen, Peugeot

On Citroen, Peugeot vehicles P1454 is documented as: Evaporative system vacuum test; EGR control circuit range/performance. P1454 points at evaporative emissions system. 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: Fuel cap not sealing or the wrong cap fitted; Cracked or perished breather hose; Purge valve stuck open; Charcoal canister split; Leaking tank seal around the pump flange.

Check first, cheapest first:

1. Refit the fuel cap firmly, clear the code and drive for a few days — a surprising share of these are the cap
2. Inspect the visible EVAP hoses for cracks and loose clamps
3. Command the purge valve with a scanner and listen for it clicking
4. Smoke-test the system if the simple checks find nothing — a small leak is very hard to see

Related Citroen, Peugeot codes:

P1454 on Ford, Jaguar, Mazda

On Ford, Jaguar, Mazda vehicles P1454 is documented as: Evaporative emission system vacuum test. P1454 points at evaporative emissions system. 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: Fuel cap not sealing or the wrong cap fitted; Cracked or perished breather hose; Purge valve stuck open; Charcoal canister split; Leaking tank seal around the pump flange.

Check first, cheapest first:

1. Refit the fuel cap firmly, clear the code and drive for a few days — a surprising share of these are the cap
2. Inspect the visible EVAP hoses for cracks and loose clamps
3. Command the purge valve with a scanner and listen for it clicking
4. Smoke-test the system if the simple checks find nothing — a small leak is very hard to see

Related Ford, Jaguar, Mazda codes:

P1454 on Honda

On Honda vehicles P1454 is documented as: Fuel tank pressure sensor, implausible signal. P1454 is stored when the ECU sees range or performance on evaporative emissions 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: 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:

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 P1454 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.