Please HELP!!!!
Thread Starter
On The Tree
Joined: Nov 2002
Posts: 142
Likes: 0
From: Baltimore, MD
Please HELP!!!! My SES light is on in my 01'WS6, the codes are 1133 & 1153 here's a description of the trouble, The powertrain control module (PCM) monitors the heated oxygen sensor (HO2S) activity for 100 seconds. During this period, the PCM counts the number of times that the HO2S switches form rich to lean, and from lean to rich. A DTC P1133 or a DTC P1153 sets when the PCM determines that the HO2S did not switch enough times.
A lean-to-rich switch is determined when the HO2S voltage changes from less than 300 mV to more than 600 mV. A rich-to-lean switch is determined when the HO2S voltage changes from more than 600 mV to less than 300 mV. This diagnostic runs once per ignition cycle. The dealer tells me it's because of my mods that are listed in my sig. they say the only way to stop the light is by getting the PCM reprogramed is this true???? If it will take care of my problem I have no problem getting the work done, but I have no idea were to take it around in MD. If any one has any insight on this or any ideas of who to get a new PCM from I would appreciate it. Thanks in Advance Scott
A lean-to-rich switch is determined when the HO2S voltage changes from less than 300 mV to more than 600 mV. A rich-to-lean switch is determined when the HO2S voltage changes from more than 600 mV to less than 300 mV. This diagnostic runs once per ignition cycle. The dealer tells me it's because of my mods that are listed in my sig. they say the only way to stop the light is by getting the PCM reprogramed is this true???? If it will take care of my problem I have no problem getting the work done, but I have no idea were to take it around in MD. If any one has any insight on this or any ideas of who to get a new PCM from I would appreciate it. Thanks in Advance Scott
On The Tree
Joined: Jan 2002
Posts: 110
Likes: 0
From: Suwanee, Georgia
Re: Please HELP!!!! Well, it could be your mods.. the only way to tell for sure would be to get a wideband running and see what your idle A/F ratios look like. You should be in closed loop and at about 14.7:1 A/F in the idle or low rpm condition. Wide Open, look for 12.7-13.0.
Have you tried using EFI live, Autotap, or Ease to see what's going on??? That's where I would start..
Also, I think you mentioned headers... are the O2's located about where they were before, or much farther downstream?
RE: Programming.. you can solve this issue with programming .. via LS1Edit or a tuner. If it really becomes an issue, you can just have the diagnostic test for those two codes disabled...
Hope this helps
Tom
Have you tried using EFI live, Autotap, or Ease to see what's going on??? That's where I would start..
Also, I think you mentioned headers... are the O2's located about where they were before, or much farther downstream?
RE: Programming.. you can solve this issue with programming .. via LS1Edit or a tuner. If it really becomes an issue, you can just have the diagnostic test for those two codes disabled...
Hope this helps
Tom
