Cause
Loose or damaged fuel rail fitting
A fitting at the fuel rail loose, cross-threaded or with a damaged seat, so the joint leaks. It is the same pressure fault as a cracked line but with a different repair, and separating the two matters because one is a torque and sealing-face question and the other is a new part.
Torque is the thing people get wrong. These fittings seal by deforming a cone against a seat, and they have a specified torque that is neither guesswork nor "as tight as it will go" — undertightened leaks, and overtightened deforms the seat so it never seals again, which turns a rail into a replacement.
Look for the leak with the engine off and the system still pressurised, since these systems hold pressure long after shutdown. A fitting that has been disturbed recently is the first suspect, and the seat should be inspected for scoring or a witness ring before a new line is fitted — a perfect line into a damaged seat leaks exactly as the last one did.
Typically a moderate job.
Some of these codes mean you should stop driving
2 of the 2 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 this can cause (2)
Codes where this is a likely explanation first, rather than merely a possible one.
Information, not instruction
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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.
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