Is It Safe to Drive With a P0261 Code?
Common Symptoms of a P0261 Fault
Cylinder 1 misfire — P0301 often stored alongside
Rough idle
EML on
Loss of power
Possible Causes of P0261
A P0261 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
Injector Wiring Short to Ground
Cylinder 1 injector wiring shorted causing low circuit voltage.
Injector Internal Short
The injector solenoid has an internal short circuit.
ECU Driver Short
ECU driver circuit for cylinder 1 injector has shorted.
Connector Fault
Connector to cylinder 1 injector has a short.
Why we don't list the exact part: A P0261 code tells you what's happening but not why. Replacing parts based on the code alone is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0261 and Your MOT
A stored P0261 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure under current MOT standards. Even if the light temporarily clears, the code remains in ECU memory and can be read by testers.
Get the fault diagnosed and repaired first, then have the code cleared and confirm the light stays off before booking your MOT.