P1284
Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2
P1284 is an OBD-II diagnostic trouble code meaning: Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2. Common causes: air-fuel ratio (afr) sensor malfunction, fuel leak in injectors. Estimated repair cost: $22–89.
Symptoms
- Increased fuel consumption
- Reduced engine power
- Black smoke from the exhaust pipe
- Unstable engine idling
- Gasoline smell from exhaust
Causes
- Air-fuel ratio (AFR) sensor malfunction
- Fuel leak in injectors
- Increased pressure in the fuel rail
- Contamination or malfunction of the air flow sensor
- Exhaust gas recirculation (EGR) system malfunction
How to Fix
- Check the operation of the bank 2 AFR sensor
- Diagnosis of fuel injectors for leaks
- Check the pressure in the fuel rail
- Clean or replace the mass air flow sensor if necessary
- Check the EGR system for correct operation
Related codes
Error P1284 by Vehicle Brand
FAQ
What does the P1284 code mean?
P1284 is an OBD-II diagnostic trouble code that indicates: Air Fuel Ratio Sensor 1 Rich Shift Monitoring Bank 2
What causes a P1284 error code?
The most common causes of P1284 include: Air-fuel ratio (AFR) sensor malfunction; Fuel leak in injectors; Increased pressure in the fuel rail; Contamination or malfunction of the air flow sensor.
How do I fix a P1284 diagnostic trouble code?
To fix P1284: Check the operation of the bank 2 AFR sensor. Diagnosis of fuel injectors for leaks. Check the pressure in the fuel rail. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1284?
Limited driving only, diagnose soon
How much does it cost to fix P1284?
The estimated repair cost for P1284 is $22–89. Actual cost depends on your vehicle, location, and labor rates.
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