Guided mode

Random or multiple cylinder misfire (P0300)

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0 Completed steps

4 Total steps

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Step 1 of 4

Capture freeze-frame and misfire counters — Current step
Shared-cause checks — Not started
Isolate the cylinder with a swap test — Not started
Inspect the plug and run a cylinder test — Not started

Diagnostic

Capture freeze-frame and misfire counters

Step 1 of 4

Read stored and pending codes, then record freeze-frame data. Display per-cylinder misfire counters where the tool supports them and note which cylinders increment.

A known set of affected cylinders and the load, speed and temperature at which the fault sets.

What did you find?

Pick the outcome you actually observed. The flow follows the branch the author wrote for it.

One cylinder is clearly affected Caution
Treat it as a single-cylinder fault: ignition and injector first.
Several or all cylinders are affected Caution
Look for a shared cause: air leak, fuel pressure, ignition supply or engine management input.

Your notes

Measurement

Completed steps

Capture freeze-frame and misfire counters Current step
Shared-cause checks Not started
Isolate the cylinder with a swap test Not started
Inspect the plug and run a cylinder test Not started

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