P246F: Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 4
Standardized SAE J2012 code · P24xx — Auxiliary emission controls
What does P246F mean?
At cold start the SCR system is unable to begin reductant dosing within the required time. Typical cause on diesel cars in winter — frozen AdBlue in the tank or lines, failed tank heater, or a slow-warming SCR catalyst.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Common causes
- High AdBlue frozen — tank or line heater not working
- Medium SCR catalyst slow to reach light-off
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P246F on the same make and model first.
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