Question about 1998 Chevrolet C1500

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Service engine light

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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Try unplugging the battery leave it off for like 5 minutes then plug it back in

Posted on Oct 29, 2008


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My 206 1.1 keeps failing emsion test had new lamba censor and cat every running well but still failing c02

Well like you say ( lamba) means o2 sensor and cat .... New ? Co2 too much gas it could be bad fuel injectors ..... Check for codes the ecm have the most important info about it

May 15, 2015 | Peugeot 307 Cars & Trucks

1 Answer

My checck engine light is blinking it came on 2 months ago i was told i neede a map sensor or cat convertor light is now blinking and car has hessitation

you not only need a cat. but to fix the misfire causing the light to flash.the light flashes to tell you not to drive veh.

Feb 24, 2015 | 2001 Mazda Protege

1 Answer

How many O2 censors in a 98 Maxima

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

Sep 04, 2014 | 1998 Nissan Maxima

1 Answer

Truck problems

check for blown gasket /exhaust leaks/coil/spark plug and wiring to distributor/ and check timing

Dec 16, 2013 | Cars & Trucks

1 Answer

Pressure before and after each converter =0psi. check engine, vsc, and vsc off lights all on but only come on when tank is 1/2 full. A technician told me to disconnect the battery and if the code comes...

What codes are you getting?

Are they cat inefficiency codes?

If they are than it doesn't matter what the back pressure is. If the cats are no longer converting exhaust gaps into oxygen, CO2, and water than they are bad.

Dec 12, 2010 | 2003 Lexus ES 300

2 Answers

02 sensors

They screw into the exuast, 02s1 is before cat convertor, It checks emissions prior to the convertor, 02s2 is after the cat convertor, it verifies the convertor has done its job

Jun 10, 2010 | 1998 Chrysler Concorde

2 Answers

I have a 1998 chevy c3500 with the 7.4 liter

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.

Oct 06, 2009 | 1998 Chevrolet C3500

4 Answers

Check Engine Light!

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

Sep 04, 2009 | 2003 Chevrolet Blazer

1 Answer


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?

Mar 26, 2009 | 2005 Mitsubishi Galant

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