O2 Sensor Trouble

[sav03cobra]

So a long while ago I made a thread about my Front O2 Sensors not switiching (turning on) after the car was hot. My car was only operating in OL and would not go to a CL system.

If the O2 sensors have been changed with new ones and the Tune is not the issue what other problems may cause the O2 sensors not to switch?

 

[po-po 5.0]

Do you have longtubes? Longtubes can cause lazy switching if the heater duty cycle isn't increased in the tune.

 

[sav03cobra]

Do you have longtubes? Longtubes can cause lazy switching if the heater duty cycle isn't increased in the tune.

I do have MAC longtubes. I will have to ask my tuner about that too. I also need to get under with a Voltmeter.

 

[po-po 5.0]

I do have MAC longtubes. I will have to ask my tuner about that too. I also need to get under with a Voltmeter.

There's sort of a default value that most people bump the heater duty cycle up to in longtube tunes, but it doesn't necessarily mean it's enough. My car threw a slow switching on one bank after being tuned. I had to go back in and basically max out the heater duty cycle to get it to go away.

 

[FreddyFingers]

what kind of codes will it throw if this happens?

 

[Tractionless1]

Good info. about the duty cycle. My tuner noted an issue with my front (only) o2's so I asked if my duty cycles had been increased so I don't foul another set.