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P1278 Engine Trouble Code

P1278 Engine

When you check engine light came on code P1278 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However your vehicle's manufacturer may have a different definition for the P1278 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on our car models.

P1278 code can be about replacing a broken oxygen sensor can eventually lead to a busted catalytic convertor which can cost upwards of $2,000. Taking your car into a shop will cost you around $200 depending on the car. However, an oxygen sensor is easy to replace on many cars and is usually detailed in the owner's manual. If you know where the sensor is, you only have to unclip the old sensor and replace it with a new one. Regardless of how you approach it, you should get this fixed right away.

P1278 Code Meaning :

P 1 2 7 8
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine Fuel And Air Metering Ambient Air Temperature Sensor Circuit Low Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector) Timing Reference High Resolution Signal A Too Many Pulses

Regarding the P1278 code, it would probably be worthwhile to carefully inspect the wire harness near the intake manifold bracket. This is done most easily from below the car in the area near the oil filter.

P1278 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P1278 OBD-II Trouble Code Air Fuel Ratio Sensor 1 Circuit Slow Response is one of the definitions for the P1278; however your vehicles manufacturer may have a different definition for the P1278 code. Please check below for you P1278 code.

Reason For P1278 Code

The reason of P1278 OBD-II Engine Trouble Code is Ambient Air Temperature Sensor Circuit Low.

P1278 DTCs may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.