OBD-II code · Powertrain (generic)
P05EB Cold Start SCR NOx Catalyst Inlet Temperature Too Low
Same as P22FF but specifically during the cold-start window - the SCR catalyst inlet temperature does not reach the threshold needed for NOx reduction in the cold-start phase, so reductant injection cannot be enabled.
Is it safe to drive with P05EB?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeat-up strategy not bringing exhaust to temp
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Scr Inlet Temperature Sensor, Scr Catalyst, Exhaust Heat Management
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.