DTC code
P040A
EGR Temperature Sensor A Circuit
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: Sensor failed
Diagnostic steps
Check the components involved: egr temperature sensor, egr cooler. Verify wiring and connectors before replacing any part. Job difficulty: medium. Typical European range — 60-400 EUR, 0.5-2 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 P040A
Nothing confirmed yet for this code. No guess is offered on purpose.
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