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Fault code P0263 means cylinder 1 contribution or balance out of specification. The ECU detects that cylinder 1 is not contributing to the torque like the others.

Typical symptoms

• Rough engine at idle
• Vibration
• Loss of power
• Smoke

Most common causes

• Cylinder 1 injector out of tolerance
• Insufficient compression
• Wrong injector coding after replacement
• Injector wiring

How it is checked in diagnosis

• Reading the corrections per cylinder
• Injector return-flow test
• Compression test
• Checking the calibration codes written in the ECU

Can you drive with code P0263?

Yes, but the engine stays rough: best to diagnose it soon.

How MasterTuning helps

We read the real values from the ECU, not just the code: that is the difference between identifying the component responsible and replacing parts by trial and error. After the repair we clear the fault and check that it does not come back. Centres throughout Italy.

Read more: vehicle database · find an installer · what is ECU remapping

Do you have code P0263 on your car? Book a diagnosis at your nearest MasterTuning centre.

Frequently asked questions

What does fault code P0263 mean?

Code P0263 means cylinder 1 contribution or balance out of specification. The ECU detects that cylinder 1 is not contributing to the torque like the others.

Can you drive with fault P0263?

Yes, but the engine stays rough: best to diagnose it soon.

Is clearing code P0263 enough to fix it?

No: if the cause is still present the code comes back after a few kilometres. Clearing should only be done after the repair, with the diagnostic tool.

How much does it cost to fix code P0263?

It depends on the component responsible: the diagnosis is precisely what identifies it with real measurements, avoiding unnecessary replacements that cost far more than the correct repair.