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subliminal_misery 10-30-2006 07:56 PM
check engine light stay on
 
i just purchased a 1998 mustang gt 4.6. the check engine light stays on. the dealer said he took it to the ford garage and had it hooked to a computer. they said it had a cracked intake. he replaced this but the light is still on. he told me to reset the computer by disconnecting the battery and plugging it back in....will this work???

explicitone 10-30-2006 08:54 PM
Re: check engine light stay on
 
yes that can work but if it does not then you need to take it and have the code read that way you know for sure what it is

bigwhitecobra 11-07-2006 08:06 PM
Re: check engine light stay on
 
ANY repeputable shop would have cleared the code, then test driven the car to make sure that the code did not come back on......Something is suspect there.

subliminal_misery 11-07-2006 10:08 PM
Re: check engine light stay on
 
Quote:
Originally Posted by bigwhitecobra
ANY repeputable shop would have cleared the code, then test driven the car to make sure that the code did not come back on......Something is suspect there.

I have a BBk exhaust system. The two rear o2 sensors are not present. Could this possibly be causing the check engine light to stay on? also, im thinking about going back to the stock exhaust system. how much could i get for my bbk exhaust? it is in excellent condition.

1989GT 11-07-2006 11:30 PM
Re: check engine light stay on
 
If the rear O2's aren't there and they haven't been turned off by a tuner/chip of some sort then yeah that'll cause a check engine light. Take the car down to auto zone and have them scan the codes (it's free) then post 'em up.

subliminal_misery 11-08-2006 04:21 PM
Re: check engine light stay on
 
Quote:
Originally Posted by 1989GT
If the rear O2's aren't there and they haven't been turned off by a tuner/chip of some sort then yeah that'll cause a check engine light. Take the car down to auto zone and have them scan the codes (it's free) then post 'em up.


I took my 98 gt and had a scan ran for codes . the code that was found is P0420 CATALYST EFFICIENCY BELOW THRESHOLD ( BANK 1). DOES ANYONE KNOW WHAT THE PROBLEM COULD BE????

1989GT 11-08-2006 05:14 PM
Re: check engine light stay on
 
Your rear O2's are causing that code. I'm suprised you're not getting P4030 also (bank 2).

bigwhitecobra 11-08-2006 06:21 PM
Re: check engine light stay on
 
Yep rear O2's aren't tuned out...I things to tune them out, but that doesn't do you any good. Oh well...go back to stock and be done with it. You could get about $150 or so for a set of used Off-road pipes.....if your lucky.

bmxmon 11-09-2006 12:46 AM
Re: check engine light stay on
 
I would imagine you could weld in bungs and put your 02 censors in your headers, though I've never done this and its just what I've heard.


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