Let me start by saying I'm new to this forum.

I recently picked up a '96 SE. After a week or so the "Check Engine" light came on. I checked the codes and this is what I got.

0304 - Knock Sensor
0504 - Transmission Control Module
0705 - EVAP System
0707 - Oxygen Sensor
0903 - EVAP Canister Vent Control Valve

Not knowing if they were all recent, I reset the ECU and kept driving the car. After 3 days, the "Check Engine" light came back on. When I checked the ECU again, I had the same 5 codes. Is it possible I have problems with all these systems or could one problem cause all these errors? Anybody have a good place to start?

Thanks

 

The knock sensor code is probably a ghost code that comes around with the CEL. The EVAP system seems to be the problem because of the two codes. This could of set off the Oxygen sensor code.

 

I replaced the rear oxygen sensor and EVAP Canister Vent Control Valve and reset the light. After driving for a day, the CEL came back on with the following codes:

0104 - Vehicle Speed Sensor
0304 - Knock Sensor

I reset it again. After driving for a few hours, it came back on with these codes:

0111 - EVAP Control System
0304 - Knock Sensor

I'm thinking about replacing the knock sensor next. Any other suggestions?

 

Change the knock sensor and get a new gas tank cap. If your lucky the cap will fix your EVAP code.