Circuit check engine light codes
Circuit check engine light codes I have these codes after driving 1000 miles to my duty station. I replaced the TPS, cleared the code and came back a day later. Car runs and idles smoothly but sometimes has a slight hesitation feel when holding the pedal down keeping the car at the speed limit but then starts to go fast as I'm holding the pedal down in the same spot. Searching other threads with P1637, could an alternator fix all this since most are all circuit related?
P0171 - system too lean (bank 1)
P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem
P0154 - 02 Sensor No Activity Circuit
P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P1637 - Generator L Terminal Circuit
P0171 - system too lean (bank 1)
P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem
P0154 - 02 Sensor No Activity Circuit
P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P1637 - Generator L Terminal Circuit
You could have multiple problems but it definitely looks like there is a power problem somewhere in here.
I'd start with the O2 sensor and TPS sensor wires and look for cuts or places where wires have come in to contact with your headers, heads, etc. (Your alternator and TPS issues could be related as they are on the same side of the engine.)
I'd start with the O2 sensor and TPS sensor wires and look for cuts or places where wires have come in to contact with your headers, heads, etc. (Your alternator and TPS issues could be related as they are on the same side of the engine.)
