1998 chevy truck my service engine light comes on still after i was told it was cat convertor and then co2 censor what can i look for next truck is running fine its just the light keep coming on after 100 miles
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In cars with EFI control there is a heated oxygen sensor(HO2S) before the cat converter and a ordinary oxygen sensor (O2S) after the cat convertor. so that means 1 of each on a 4 cylinder engine and 2 of each on a "V" engine . They are not interchangeable so a O2 sensor will not replace a HO2S sensor
you can't change the timing in this engine nor can you adjust the valves. The timing is adjusted throught the computer therefore there is no mechanical way to change this. You might be able to with some kind of programmer or computer program.
Yes your cat will cause it to come on... There is a sensor before the cat that measures the emissions from your headers, then there's another sensor after your cat that measures the emissions after it passes through your cat. a faulty cat will cause the sensor to register differently triggering the light. Driving with a broken cat can cause serious damage to your engine as it also alters the backpressure
You have a V6 engine, bank one is the row of cylinders on the passenger (right) side, bank two is the row of cylinders on the drivers side (left). Your codes indicate an inefficiency in the cat on the left side but this could be due to a bad O2 sensor or an engine that is out of tune and overloading the cat. This car seems too new to have a bad cat. I would change the plugs and the O2 sensor after the cat before going any further. The reason I say the O2 after the cat, it's the one that is critical in sensing cat efficiency. What is the mileage?