P126F
Nitrogen Oxide Sensor Trailing Throttle Check Linear Lambda Signal Too Rich
P126F is an OBD-II diagnostic trouble code meaning: Nitrogen Oxide Sensor Trailing Throttle Check Linear Lambda Signal Too Rich. Common causes: nox sensor malfunction, problems with the fuel injection system (re-rich mixture). Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Reduced engine power
- Check Engine Light Is On
- Increased emissions of harmful substances
- Unstable engine idling
Causes
- NOx sensor malfunction
- Problems with the fuel injection system (re-rich mixture)
- Dirty or faulty injectors
- Problems with the EGR system
- Oxygen sensor malfunction
How to Fix
- Check NOx sensor readings using diagnostic equipment
- Check the operation of the fuel injection system and the condition of the injectors
- Check the serviceability of the EGR system
- Check the operation of oxygen sensors
- If necessary, replace the NOx sensor
Related codes
FAQ
What does the P126F code mean?
P126F is an OBD-II diagnostic trouble code that indicates: Nitrogen Oxide Sensor Trailing Throttle Check Linear Lambda Signal Too Rich
What causes a P126F error code?
The most common causes of P126F include: NOx sensor malfunction; Problems with the fuel injection system (re-rich mixture); Dirty or faulty injectors; Problems with the EGR system.
How do I fix a P126F diagnostic trouble code?
To fix P126F: Check NOx sensor readings using diagnostic equipment. Check the operation of the fuel injection system and the condition of the injectors. Check the serviceability of the EGR system. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P126F?
Yes, but get it checked soon
How much does it cost to fix P126F?
The estimated repair cost for P126F is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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