garajizOBD-II code · generic
P21B4
NOx Adsorber - Over Temperature Bank 1
- System
- P2 — Powertrain / emissions (generic)
- Severity
- Moderate (3/5)
- Can I keep driving?
- Drive with caution
What does P21B4 mean?
P21B4 is defined as “NOx Adsorber - Over Temperature Bank 1”.
Drive gently and only as far as you need to; have it checked as soon as possible.
Related codes
- P21B3Closed Loop NOx Adsorber Control At Limit - Too High
- P21B5NOx Adsorber - Over Temperature Bank 2
- P21B2Excessive Time To Enter Closed Loop NOx Adsorber Control
- P21B1Reductant Level Sensor C Circuit Intermittent/Erratic
- P21B0Reductant Level Sensor C Circuit High
- P21AFReductant Level Sensor C Circuit Low
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This page is general information; an exact diagnosis needs measurements and a technician’s check.