DTC code
P0490
EGR A Control Circuit High
Technical guide
reference — not individually verifiedSymptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Probable causes
- high: Short to B+
- low: Connector pins corroded - high contact resistance
- low: Supply wire pinched against B+ source
Diagnostic steps
Check the components involved: egr valve. Verify wiring and connectors before replacing any part. Job difficulty: medium. Typical European range — 80-500 EUR, 0.5-2.5 h. Reference values only.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on P0490
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