obdll code

[BK19]

i have the code po420 come up on my 97 s-10 4.3 W motor catilyst below threshhold bank 1 what sensor and where is it thanks

[Loose]

O2 sensor after cat

[BK19]

thanks man

[Loose]

That being bad has no effect on engine performance just have to look at light. If your cat is bad I have a little thing to stick in there to make the computer think every thing is good

[Big Buck Buster]

i have the code po420 come up on my 97 s-10 4.3 W motor catilyst below threshhold bank 1 what sensor and where is it thanks

Check to see if your convertor is rattling. Bang on it with your fist, or a rubber mallot. If the convertor is rattling, it is bad, and that is why the code set. The convertor is not converting the exhaust gas effeciently into H2O. The PCM compairs readings of the upstream O2 sensors, and the downstream O2 sensors. If both the upstream and downstream are switching at/or close to the same, the convertor is bad and needs to be replaced. If the convertor is bad, make sure, when you do replace it, there are no engine misfires, or the new convertor won't last long.

Exhaust leaks can cause this code also.

Sometimes, but not often, the O2 sensor does this.

[Loose]

There are about five different things that could cause that though so not just the just that sensor

[Loose]

Wow I type slow on this blackberry

[Jeremy airjer W]

Welcome to FM/HSO/Ice Leader Loose!

Cat inefficiencies are rarely the O2 Sensor but not impossible. More likely the cat is not doing its job as well as it should.

That being bad has no effect on engine performance just have to look at light. If your cat is bad I have a little thing to stick in there to make the computer think every thing is good

If you do this your vehicle is no longer road legal and not eligible to be licensed as an on road vehicle. You can no longer sell the vehicle as well. This is clearly outlined in the Federal Emissions Act for motor vehicles.

Although Minnesota no longer has emissions testing there are still emissions laws. We are on the honor system and it only lasts as long as we honor it. If air quality goes down you can bet emissions testing will be reinstated. This will cost us more money, taxes, to keep our cars on the road. Nobody likes that idea!

Giving advice on how to bypass an emissions system is in poor judgment IMO!!

[Macgyver55]

Happy B-Day Jer! Oh, and I agree with the above.

[BK19]

I will fix it the legal way but I have alot of issues with this truck first I have to replace the waterpump then the brake booster plus I have another electrical isssue I have to keep turning the ignition key off and on to get all the waring lights to litght up before it will start if the lights aren't on it won't run

[Jeremy airjer W]

HMMMMM, Sounds like an ignition switch?