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Fault code P0301 means misfires on cylinder 1. Cylinder 1 is not burning properly: the fault is localised and therefore easier to isolate.

Typical symptoms

• Rough engine and vibration
• Loss of power
• Engine light on or flashing
• Rising consumption

Most common causes

• Cylinder 1 spark plug or coil
• Dirty or failed injector
• Loss of compression (valves, rings)
• Injector or coil wiring
• Localised intake leak

How it is checked in diagnosis

• Swapping the coil or injector with another cylinder: if the fault moves, that is the component
• Cylinder compression test
• Reading injection corrections per cylinder

Can you drive with code P0301?

With a flashing light no: ease off and have the car checked.

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 P0301 on your car? Book a diagnosis at your nearest MasterTuning centre.

Frequently asked questions

What does fault code P0301 mean?

Code P0301 means misfires on cylinder 1. Cylinder 1 is not burning properly: the fault is localised and therefore easier to isolate.

Can you drive with fault P0301?

With a flashing light no: ease off and have the car checked.

Is clearing code P0301 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 P0301?

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.