therock

iTrader: (2)

We are troubleshooting some problems and speculation is bad o2 sensors.

It is argued unless it tosses a code it's ok.

True or False?

KLUG'S SS

iTrader: (6)

Yes yes and yes! You can have bad O2 sensors with no codes.

Old worn out O2 sensors can end up switching too slow to function right.

Over 75% of emissions tests are failed due to worn out old O2 sensors with no fault codes what so ever.

budhayes3

iTrader: (19)

+1, you have to get some form of a scanner or scanning software on there to monitor O2 sensor activity...if the O2 sensors aren't switching rapidly, or aren't reading voltages that range from 0 to .9 volts, you have an O2 sensor problem...

therock

iTrader: (2)

Attached a scan of some normal driving.

what do you think of the o2 readings? Normal?


I see some kr but it must be all apart of GM's stock tuning I guess.