Powertrain
Definition only
Lights the check engine lamp
P24E1: NH3 Sensor Circuit
Standardized SAE J2012 code · P24xx — Auxiliary emission controls
What does P24E1 mean?
A general circuit fault on the NH3 (ammonia) sensor - measures ammonia slip downstream of the SCR catalyst to detect AdBlue overdose.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Open in sensor or wiring
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P24E1 on the same make and model first.
P24E1 in the community
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