Confucius37

OK so i ran a CEL search and it turns out i have a 1, 45, 65, and a 90

1 - Oxygen Sensor "A" (Primary)

45 - System Too Lean or Too Rich

65 - Oxygen Sensor Heater (Secondary)

90 - Evaporative Emission Control System

I have a 98 civic ex, completely stock. they all have to do with the fuel system, but there are so many possibilities i dont know where to start. My first guess is that the O2 sensor is just bad so i should replace that, and maybe there could also be something wrong with the EVAP system. Thanks for the help.

Ricey McRicerton

The first two are probally very much the same thing. I'd try replacing your primary 02 sensor (just off the head) and that will probally clear up your primary 02 sensor code and your too rich code (1 and 45). I'd stay away from Bosch sensors.

The secondary 02 heater could be your secondary 02 sensor starting to go out due to the excessive fuel pumped into your engine when you are running in "limp" mode because your ECM isn't getting a good signal from your primary 02 sensor. I'd try replacing the primary and resetting your codes (pulling the 7.5A fuse in the fuse box under the dash by the battery) before I'd replace the secondary.

Last one's got me. Never had to work on an Evap Emissions control, but I'd be willing to bet it's a result of the overy rich conditions presented by the primary 02 being on the fritz.

Confucius37

thanks man, ill try and do that asap