check engine light stay on

subliminal_misery · 10-30-2006, 07:56 PM

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

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

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

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

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

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

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

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

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.

10-30-2006, 07:56 PM	#1
subliminal_misery Registered Member Join Date: Oct 2006 Posts: 5	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???

10-30-2006, 08:54 PM	#2
explicitone Registered Member Join Date: Apr 2002 Location: racine ,wi Posts: 691	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 __________________ RUN IT STAIGHT AND RUN IT HARD ________ Novi 2000 60' 1.46 1/4 10.67 mph 126.5 _________

11-07-2006, 08:06 PM	#3
bigwhitecobra Huh? Whatcha said? Join Date: Oct 2000 Location: Fayetteville, NC Posts: 1,073	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. __________________ 2003 GT White---STOLEN May you burn in hell whoever took it. Dumbazz didn't even get the good engine that was in the garage.

11-07-2006, 11:30 PM	#5
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	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. __________________ 89GT,Pro-Bullet 306, H/C/I and a bunch of other stuff. Sold 00GT, Vortech S-Trim, Steeda Boost Pipe, C&L intake, Mac off-road H-pipe, Flowmasters, B&M Ripper shifter, Eibach Sportline springs, Koni Struts/shocks, MM full length subframe connectors, Cobra brakes, 3.73's. My Car Domain Page

11-08-2006, 05:14 PM	#7
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	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). __________________ 89GT,Pro-Bullet 306, H/C/I and a bunch of other stuff. Sold 00GT, Vortech S-Trim, Steeda Boost Pipe, C&L intake, Mac off-road H-pipe, Flowmasters, B&M Ripper shifter, Eibach Sportline springs, Koni Struts/shocks, MM full length subframe connectors, Cobra brakes, 3.73's. My Car Domain Page

11-08-2006, 06:21 PM	#8
bigwhitecobra Huh? Whatcha said? Join Date: Oct 2000 Location: Fayetteville, NC Posts: 1,073	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. __________________ 2003 GT White---STOLEN May you burn in hell whoever took it. Dumbazz didn't even get the good engine that was in the garage.

11-09-2006, 12:46 AM	#9
bmxmon Registered Member Join Date: Mar 2004 Location: Minnesota Posts: 950	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. __________________ Alex

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