P0479: Exhaust Pressure Control Valve A Intermittent
What to do
Usually driveable. Note whether the fault appears only when hot — that is diagnostic in itself.
What this code means
The exhaust pressure control valve circuit is behaving intermittently. As with the pressure sensor, heat cycling on a connector near the exhaust is the usual mechanism, and the fault will often appear only once the engine is thoroughly warm.
Likely causes
Start here
- Damaged wiring harness near exhaust heat · moderate
- Corroded or loose connector · easy
- Intermittent open in sensor wiring · moderate
Less common
Symptoms
Components involved
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.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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