Fuel and air

P0252 Injection pump fuel metering control: reading or operation not right ("A")

By: Diagno editorial team · Updated: 2026-10-15

P0252 means: Injection pump fuel metering control: reading or operation not right ("A"). The computer monitors fuel pressure in the system. Drive gently and have the car checked soon. The most common repair costs about €50–100 in Estonia, depending on make and model. The most common cause: clogged fuel filter.

Is it safe to drive?Get it checked soonDrive gently and have the car checked soon.

Fuel filter replacement€50–100parts and labour in Estonia, depending on make and model

What it means

The computer monitors fuel pressure in the system. The pressure is wrong, the regulator isn't working, or the pressure sensor reading isn't plausible. There is a signal, but the reading or operation isn't plausible. The cause may be the part itself or a real mechanical fault.

What you may notice

Engine light on
Hard starting
Less power or limp mode
The engine may stall

What could be wrong

1Clogged fuel filter · Fuel filter replacement €50–100
2Weak fuel pump · Fuel pump replacement €250–500
3Faulty pressure regulator or valve · Valve replacement €90–180
4Fuel pressure sensor reading wrong · Sensor replacement €80–160
5On diesels, injectors leaking back · Injector replacement €200–400

Repair difficulty: Moderate

What you can check yourself

If the fuel filter hasn't been changed for a long time, start there. Check for any fuel leak or smell. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

We measure fuel pressure with the diagnostic tool and a gauge
We check the filter, pump and regulator
On diesels we measure injector back-leakage
We replace the faulty part

Standard SAE description: Injection Pump Fuel Metering Control A Range/Performance (Cam/Rotor/Injector)

This code usually comes with: Check engine lightSee what the light means →

Related symptoms: Car won't start · Loss of power or limp mode

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.

Book a diagnostic check

Questions

What does fault code P0252 mean?

Injection pump fuel metering control: reading or operation not right ("A"). The computer monitors fuel pressure in the system. The pressure is wrong, the regulator isn't working, or the pressure sensor reading isn't plausible. There is a signal, but the reading or operation isn't plausible. The cause may be the part itself or a real mechanical fault.

Can I drive with code P0252?

Drive gently and have the car checked soon.

How much does it cost to fix P0252?

It depends on the cause: fuel filter replacement €50–100; fuel pump replacement €250–500; valve replacement €90–180. Prices include labour at €45/h, depending on make and model.

How is P0252 fixed?

We measure fuel pressure with the diagnostic tool and a gauge. We check the filter, pump and regulator. On diesels we measure injector back-leakage. We replace the faulty part.

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.