P050E
Cold Start Engine Exhaust Temperature Too Low
During the cold-start strategy the ECU monitors exhaust temperature to ensure catalyst light-off. The measured EGT remains below the target threshold within the allowed time - heat-up strategy is not effective. Causes include excessive heat loss, very rich mixture cooling the exhaust, or a faulty EGT sensor.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Excessive heat loss between port and catalystCommon
- EGT sensor drifts lowPossible
Parts involved
- Exhaust Gas Temperature Sensor
- Cold Start Strategy
P050E is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.