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P2453: Diesel particulate filter pressure sensor A range/performance

The diesel particulate filter pressure sensor is giving values that do not match how the engine is running. Usually its pipes or the sensor itself.

Code P2453 at a glance
CodeP2453
SystemEngine and transmission
GroupP24xx, EGR, EVAP and particulate filter
TypeGeneric: it means the same on every make
Can you keep driving?With care

What P2453 means

This sensor measures exhaust pressure at the particulate filter, usually the difference between inlet and outlet, so the ECU knows how much soot it holds and when to regenerate. On sensor A the ECU sees values it does not believe: they fail to change when they should, or do not fit engine speed and load. Which sensor is A is set by each manufacturer, though many cars have only one.

Most common causes

  • Pressure pipes loose, split, blocked or connected the wrong way round
  • Metal exhaust tapping blocked with soot
  • Faulty or drifting pressure sensor
  • Exhaust leak near the filter
  • Connector with a poor contact distorting the signal

Symptoms

  • Engine warning light on
  • Possible limp mode with reduced power
  • Regenerations delayed or run too often
  • Higher fuel consumption if it regenerates frequently

Can you drive with P2453?

With care You can drive, but get it to a garage soon: without this reading the ECU regenerates blindly and the filter can end up blocked.

How to check it

With the ignition on and engine off, live differential pressure should read close to zero, and it should rise when you rev the engine at standstill. If it stays fixed or shows silly values, check the sensor connector and pipes.

How to read and clear P2453 with Final OBD

Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2453 with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

P2453 is a generic code, so it means the same on any make, for example on Audi, Fiat, Mazda, Opel / Vauxhall, Peugeot, Toyota. See what Final OBD does on your car in makes and models.

What does code P2453 mean?

This sensor measures exhaust pressure at the particulate filter, usually the difference between inlet and outlet, so the ECU knows how much soot it holds and when to regenerate. On sensor A the ECU sees values it does not believe: they fail to change when they should, or do not fit engine speed and load. Which sensor is A is set by each manufacturer, though many cars have only one.

Can you drive with P2453?

You can drive, but get it to a garage soon: without this reading the ECU regenerates blindly and the filter can end up blocked.

How do you clear P2453?

With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2453 comes back.