What a code actually tells us
A P0301 does not mean “replace the coil”. It means the computer saw cylinder 1 misfire. The cause could be the coil, the plug, an injector, a vacuum leak, low compression or the wiring to any of them. Our job is to find which, and prove it, before you pay for a part.
How we prove it
We reproduce the fault, then test the circuit with the car running — live data, resistance and voltage against the manufacturer figure, and a substitution test where one is valid. If swapping a coil to another cylinder moves the misfire with it, that is proof rather than opinion.
What you get
The codes as they were stored, the readings we took, the figure they should have been, and a plain sentence explaining what failed. If we cannot find it, we tell you that too — and you are not charged for a repair that did not fix anything.
Tell us the symptom. We will tell you the next opening.
The chat takes the symptom and the vehicle, then hands it to the desk. It books appointments — it never tries to diagnose your car in a chat window.