o/d light, check engine light and rough idle - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 02-22-2014
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o/d light, check engine light and rough idle

I was hoping i could find some help here. I just changed my pre cat o2 sensors and spark plugs. truck was running perfect before I did this. When I was done I reconnected the pos battery cable, started the truck and immediately the o/d light and check engine light came on. The truck acts like it doesnt want to go anywhere. It completely chokes out above 3k and has no power. Personally I think its an electrical issue but I'm not sure. I cant exactly get it to autozone to have the code pulled. Any help would be much appreciated. 05 ranger 3.0
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Old 02-22-2014
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Is the speedometer working?

Reads like you disconnected the speed sensor on the rear axle.
Did you need to move any wires when replacing that O2 sensor.

VSS or speed sensor not working will turn on CEL and O/D light and ABS light on some.

Engine shouldn't be effected through.

I would disconnect Negative battery terminal for 5 minutes to reset computer, and look for loose wires during that time

Last edited by RonD; 02-22-2014 at 10:27 PM.
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Old 02-22-2014
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Are you sure you put your spark plug wires back in the right order. Double check they are in the right spots.
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Old 02-23-2014
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swap plug wires 5 and 6 the coil pack is weird on these trucks 123 are in order but it goes 465 i believe on the pack thats what i did on my first tuneup by mistake and it ran but was super rough.
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Old 02-23-2014
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Quote:
Originally Posted by green99 View Post
Are you sure you put your spark plug wires back in the right order. Double check they are in the right spots.
Yes I replaced them one at a time as not to mix them up.
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Old 02-23-2014
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Quote:
Originally Posted by RonD View Post
Is the speedometer working?

Reads like you disconnected the speed sensor on the rear axle.
Did you need to move any wires when replacing that O2 sensor.

VSS or speed sensor not working will turn on CEL and O/D light and ABS light on some.

Engine shouldn't be effected through.

I would disconnect Negative battery terminal for 5 minutes to reset computer, and look for loose wires during that time
I'm being told that my year model doesn't have VSS. Apparently it uses the abs sensor ring.
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Old 02-23-2014
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Originally Posted by wtf man View Post
I'm being told that my year model doesn't have VSS. Apparently it uses the abs sensor ring.
Yes, same thing, the axle sensor is the VSS for ABS and speedo
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Old 02-23-2014
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Upon further investigation I discovered that a fuse had blown on the main fuse block. I believe it happened from disconnecting the pos cable instead of the negative. A rookie mistake I know. Thank you to you and everyone else who who took the time to give advise.
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Old 02-23-2014
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Thanks for the update.

Good job on finding the problem
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