My truck has been tripping the SES light. I took it over to be scanned and the code was for the oxygen sensor voltage out of range. I replaced all four sensors and reset the computer. Once it cycled again the light came back on and the code was the same thing only this time it was for the two front sensors. When we drove it with the scanner hooked up the voltage readings were exactly what they should be on all sensors. My mechanic that was helping me seems to think that something is glitched with my program. Do you think I should ask for a new tune? I did put on a corsa exhaust since my last tune so a new tune could adjust for that also, but I would like to find the root of my trouble before I add more possibilities to the mix. Thanks

 

If you just installed the tune and SES lights are occuring you need to let Allen now, he will fix the problem. You shouldn't be throwing an SES light when a new tune has just been installed.
Philip S.

 

get with allen and tell him whats going on...he'll fix you up....bottom line is he cant fix it if he does'nt know whats going on

 

the tune is about a year old. I have been tripping this code for about 2 months.

 

how long has the tune been in. did it start this after the exhaust mod? you say the readings are normal on a scanner. the scanner gets the readings from the pcm. i would look into the exhaust and make sure there are no leaks at all.

 

the problem was there before I got the exhaust in. I was going to wait till I found the problem before installing it but I couldn't wait to hear my truck with the corsa. I think I will give Nelson a call and see what he thinks. This is definitly killing my performance. Thanks

 

Are you sure its not the rear o2's for the cats?

 

well the sensors are all brand new and before I reset the computer it said they were all bad. After reseting the computer the code was only for the front two. But all of the sensors show as being in the right voltage range....