P1478 Engine Trouble Code
Meaning of P1478 engine trouble code is : Theoretically you can drive for a few weeks or even months with a broken MAF sensor. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. At a shop, the replacement cost is between $200-$300 depending on the car, but that's usually the cost of parts because the labor is relatively simple.
P1478 Possible Solution:
Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.
P1478 Code Meaning :
|OBD-II Diagnostic Powertrain (P) Trouble Code For Engine||Fuel And Air Metering||O2 Sensor Heater Circuit Malfunction||Cylinder 10 Contribution/balance Fault||Clutch Position Sensor Circuit Malfunction|
The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue.
P1478 OBD-II Diagnostic Powertrain (P) Trouble Code DescriptionP1478 OBD-II Trouble Code Cooling Fan Driver Fault is one of the definitions for the P1478; however your vehicles manufacturer may have a different definition for the P1478 code. Please check below for your specific make. P1478 code.
Reason For P1478 CodeThe reason of P1478 OBD-II Engine Trouble Code is O2 Sensor Heater Circuit Malfunction.
P1478 DTC reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.