OBD 2 codes

[kenmac]

My son has a chevy s-10 PU (4.3 v 6)

My code reader states code P0420 Which I believe is an 02 sensor.(Catlyst system efficiency below threshold Bank 1) Anyone which side of the vehicke is considered bank 1 ? Drivers side passenger side ??

Thanks

 

[number two]

Drivers side.

 

[kenmac]

Drivers side.

Thanks,

That answers why I'am still getting the code. I replaced the passenger side ( as I didn't know what were calling Bank 1). I won't buy another I'll just swap it out. I didn't throw the 1 I took out away

 

[coldmaker0]

my daughter had the same truck and engine.these engines are notorius for cataletyc converters going out we rreplaced hers twice .if i remember right that was the same code we got

 

[kenmac]

my daughter had the same truck and engine.these engines are notorius for cataletyc converters going out we rreplaced hers twice .if i remember right that was the same code we got

I hope it's not the cat. converter. The sensor was only $80.00. I'll know if I swap sides with the sensor & still get the same code. I wish the codes were a little more specific. I have a haynes manual on that truck . I'll look & see if there is any info. specific to that code

 

[automech]

Cat codes generally mean the cat is bad. The O2s are tested separately and have their own codes. Maybe you'll get lucky though. I use oem replacement cats cause I've had some comebacks with aftermarket units for GMs.

 

[kenmac]

Cat codes generally mean the cat is bad. The O2s are tested separately and have their own codes. Maybe you'll get lucky though. I use oem replacement cats cause I've had some comebacks with aftermarket units for GMs.

Well I found it in my haynes manual. That code is in fact for the cat. I didn't know that my son had a muffler shop to install a high flow cat. to go along with his dual muffler set up. After talking to a guy at another muffler shop.He says, The high flow cats. aren't a match for the computer.So, the computer says (or thinks) the cat . is bad.Thanks for all the replys

 

[TrippleT]

You might want to talk to your dealer and have them flash your trucks computer. But, then it might be even worse. I had to flash my Venture once to keep the oxygen sensor from coming on all.

 

[Sackett2]

Also a "unofficial" option is a o2 spacer, this lifts the o2 sensor out of the exhaust streame and fools the computer. I see these on tuner cars a lot, where they have exhaust mods.
RalliTEK O2 Sensor Spacer
Re-flashing generally won't work, the re-flashes are meant to refine the cars function with OEM equipment/problems, not aftermarket mods

 

[automech]

Don't forget to use the O2 spacer on the downstream O2 not the upstream I don't use them but I have seen them on Subees.

 

[Sackett2]

Don't forget to use the O2 spacer on the downstream O2 not the upstream I don't use them but I have seen them on Subees.

LOL, Guess what kind of shop I work at?

3 years ago I went through a class that played with the rear o2 sensor, sent false info into the computer. End result, A rear o2 sensor can control fuel trim more than the manufactures tell us. After that class, I became a firm believer in not adjusting what the engineers made. Ford is starting a data called "aft fuel trim" on their scan tools.

 

[orezok]

Also a "unofficial" option is a o2 spacer, this lifts the o2 sensor out of the exhaust streame and fools the computer. I see these on tuner cars a lot, where they have exhaust mods.
RalliTEK O2 Sensor Spacer
Re-flashing generally won't work, the re-flashes are meant to refine the cars function with OEM equipment/problems, not aftermarket mods

It's a lot cheaper to just go to your local auto parts store and buy the $2 "anti-foul" plug spacers. You might have to drill the centers out and screw 2 together to get the increased depth necessary.