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Tank venting and fuel vapours

P0451 Tank pressure sensor reads wrong

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P0451 means: Tank pressure sensor reads wrong. The tank pressure sensor measures pressure in the fuel vapour system. OK to drive, but have it checked soon. The repair usually costs about €50–250 in Estonia. The most common cause: pressure sensor has failed. Other possible causes: connector or wire, hose is disconnected.

Is it safe to drive?OK to driveOK to drive, but have it checked soon.
Typical repair cost€50–250parts and labour in Estonia

What it means

The tank pressure sensor measures pressure in the fuel vapour system. Its reading doesn't add up.

What could be wrong

  1. 1Pressure sensor has failed
  2. 2Connector or wire
  3. 3Hose is disconnected

What you can check yourself

Tighten the fuel cap properly and see whether the code comes back. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We check the sensor reading
  2. We check the hoses and wiring
  3. We replace the sensor

Standard SAE description: EVAP System Pressure Sensor Range/Performance

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

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Questions

What does fault code P0451 mean?

Tank pressure sensor reads wrong. The tank pressure sensor measures pressure in the fuel vapour system. Its reading doesn't add up.

Can I drive with code P0451?

OK to drive, but have it checked soon.

How much does it cost to fix P0451?

Roughly €50–250 in Estonia. The price depends on exactly what has failed and on the car.

How is P0451 fixed?

We check the sensor reading. We check the hoses and wiring. We replace the sensor.

Related codes

P0440Fault in the fuel vapour (EVAP) systemP0441Tank purge not working properlyP0442Small leak in the fuel vapour systemP0443Fault in the purge valve wiringP0446Charcoal canister vent valve not workingP0449Fault in the canister vent valve wiringP0455Large leak in the fuel vapour systemP0456Very small leak in the fuel vapour system

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

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