Cause
Cylinder sealing lost through worn rings, burnt valves or a failed head gasket. A misfire that no amount of ignition or fuel work resolves is the point at which compression should be measured rather than more parts fitted.
Typically specialist work. Needs equipment or training most home workshops do not have.
27 of the 52 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes where this is a likely explanation first, rather than merely a possible one.
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Every other test on a car asks whether a component is working. A compression test asks something more fundamental and more useful: is the cylinder still a sealed box? It is worth d...
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