P0155 is not telling you which part is defective, it is saying there is a problem in the system and that the triggers the fault code. In this case you have a O2 sensor whose heater is not heating. This may be the senor or the wiring to it.
P0155 OBD-II Trouble Code: 02 Sensor Heater Circuit Malfunction in cylinder Bank 2 (V6 only), Sensor 1, this is the sensor before the catalyst.
SOURCE: p0155 error code
Bank2 sensor 1 is the driver side top or precat sensor.
The code is for the heater circuit of the sensor
SOURCE: 2002 Mitsubishi Galant 2.4 with repeating error codes P0335,P0340
Check your timing marks , you may have jump the tooth on a timing belt.
SOURCE: My engine light is on and the machine gives a code
p1751= auto transmission control relay malfunction.according to mitsubishi it's 1 of 3 things.pretty straightforward.either the relay is bad,loose connector,or failed pcm (powertrain control module.
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