02-03-2012, 12:01 AM
My check engine light was on because i didnt have o2 sensors, i bought a new CFM high flow cat and put bosch o2 sensors in it and cleared the codes with a code reader. The light came back on not too long after doin all that but isnt giving any codes. Tried to clear the light again and it just keeps comin back on without any codes, does anyone know whats goin on? Thanks for the help
02-03-2012, 12:15 AM
unplug your neg for a few mins then try again.
02-03-2012, 12:18 AM
Ok ill try that :) thanks again
02-03-2012, 01:44 AM
maybe a dumb question but light is on with the engine running because the light selftests with the key on but the engine off
02-03-2012, 02:16 AM
If I remember right, the SVT doesn't like Bosch O2 sensors [scratch]
02-03-2012, 10:05 AM
Yes the engine is on. And thats what ive heard bout the bosch sensors but i just dont understand why it wont give any codes...
02-03-2012, 10:18 PM
im a new svt owner, check light on... i just replace my bank 1 o2 sensor 120 miles ago, and the light still comes on! i have already unplug a couple times the negative, and the light comes again after 40 / 50 miles. i did install a bosh o2 sensor.
what else should i do?
02-03-2012, 10:21 PM
Try a motorcraft O2 sensor? Check E-bay surely you can find them a lot cheaper than from a dealer.
02-03-2012, 10:37 PM
try a oem sensor i have heard of people doing what u have put in a aftermarket and have the same problems until they change it back to a oem sensor
02-03-2012, 10:43 PM
Ima try that cause nothin else is workin
02-04-2012, 08:29 PM
try a different code reader
02-05-2012, 11:43 AM
What code reader are you using? Try different o2 sensors.
02-05-2012, 01:15 PM
ill try a different o2 sensor. thanks!
02-05-2012, 05:36 PM
If you have a high flow cat, you may need to turn off your rear o2 or put a cheater on it. Also, the rear o2 is in a horrible location on the stock cat and often gets bumped when you bottom out on the header and bends the 02 sensor and throws the code and immediately needs to be replaced.
02-06-2012, 03:07 AM
Same happens to me. Usually unplugging neg. Fixes it
02-11-2012, 04:50 PM
def use the OEM sensors, the bosch sensor throws codes and trying to use aftermarket o2 sensors is unnecessary!
02-14-2012, 01:23 PM
I have same problem on my SVTF. Exhaust is stock so you can try making a o2 cheater http://www.focusfanatics.com/forum/showthread.php?t=130381&highlight=cheater
That's what I'm gonna do!