View Full Version : Check engine light @ 85MPH WHY!

03-28-2007, 12:59 PM
Just like the title says my check engine light turns on when I hit about 85mph I checked for codes and my TPS was bad so I changed it out and it was fine for a day or so. but this morning on the highway it came on again. I notice nothing different in the way it drives. It rolls nice and smooth then when I slow down the CE light turns off. What could this be? Any input would be appreciated. 93 5speed


David Neibert
03-28-2007, 01:06 PM
Check the codes again.


Kit Sullivan
03-28-2007, 01:09 PM
O2 sensors could be getting weak or slow.

03-28-2007, 01:23 PM
Ill check codes again tommorow but I was thinking it might be the O2s.

Thanks Guys. Isiah

03-28-2007, 05:02 PM
its tellin you your goin to fast :p :p :p :p

03-28-2007, 05:05 PM
its tellin you your goin to fast :p :p :p :p

not true...... there's no such thing :)

03-28-2007, 05:08 PM
not true...... there's no such thing :)

i know lol

03-28-2007, 06:13 PM
You sure it's not your shift light?

03-28-2007, 11:09 PM
You sure it's not your shift light?

At 85? Had mine to 95 plus the other day in 3rd (shhhhh) and no shift light.


03-28-2007, 11:09 PM
Mine used to do that before I replaced the O2 sensors. Now it may do it once a month and I hit 85 quite frequently. It's usually when I'm getting on it pretty hard then it goes out while I coast.

03-29-2007, 12:09 PM
I ordered some O2s from RockAuto but still gonna check codes tonight. Yes im positive its not my shift light and it does turn off about 1-2 min after I let off.

03-30-2007, 11:41 AM
Checked codes and Im all clear. O2s came in this morning and Ill put them on tonight. Hope this fixes the problem.

04-08-2007, 05:01 AM
Speed Sensor Is Tryin' To Catch Up To U.

04-08-2007, 09:39 AM
Havent had the problem since I replaced the O2s.