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Hello. Here are the trouble code definitions.
DTC P0498: EVAP Canister Vent Shut Valve Circuit Low Voltage. Which is normally a EVAP canister vent shut valve.
DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction, which is normally a defective primary a/f (air fuel or commonly called oxygen sensor) sensor.
I would first recommend clearing the codes and retry to see if the codes duplicate themselves. If they do, you will know there is a problem.
If you need anything else, let me know.
Ok, you definetly have a problem. I like to clear them (just to make sure there is no computer glitch) both sensors can be tested at Honda with an HDS scan tool, but most likely, the sensors are bad (replaced both of them several times) The only way to be certain is to test them of course.
If you have access to a volt meter, the a/f sensor can be tested with on of those. Let me know.
The a/f sensor is located in the exhaust pipe. The # 1 sensor is the first one from the engine. Yes, I have changed several. How many miles are on your Civic? This might be under warranty.
Ahh! That's horrible. I think that is very unfair.
If the sensor has been changed, it could be a wiring problem. Is your Civic a dx,lx, ex, or si. Manual or automatic? I will start sending you the troubleshooting procedure. Was the sensor broke in the wreck? If so, check the No. 11 FI SUB (15 A) fuse in the under-hood fuse/relay box. Sometimes it will pop that fuse in a wreck.