check engine light stay on

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).

11-07-2006, 11:30 PM	#2
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	#4
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

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