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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 08-21-2007
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Icon8 ANOTHER check engine light



Ok well sure enough I got another check engine light. Went to Autozone got the damn code pulled and it gave me:

P0174 (Too Lean) The guy told me it was in "Bank 2 after the cat" ............Idk. Soo theres the code. Any help would be great guys. Thank you. I just getting fed up with this light already.


1996 ford ranger stx, 4.0 EFI. 4X4
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Old 08-21-2007
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and yeah there was an old thread here: https://www.ranger-forums.com/forum2...t=45668&page=1

But I already did the Pcv valve, and hose.........it was good for 2 weeks now its back on again.....?
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Old 08-21-2007
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I know you have a high mileage truck. Is it possible that a CAT is bad.
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Old 08-21-2007
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^^very possible......a plugged or plugging it would cause problems......

i would possibly look at the cat converter route........you have done just about everything else.....

have you ever installed a gasket in between the 2 intake manafolds and replaced the small rubber gaskets in the upper intake manafold? that could also be a problem.....i was getting a lean code and sure enought i had to install a gasket that wasn't there to begin with.......(also did it in my mom's '97 Explorer which the gasket wasn't there)



BTW: my offer still stands on my truck Shane
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Old 08-21-2007
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Quote:
Originally Posted by bryanjints
I know you have a high mileage truck. Is it possible that a CAT is bad.

how would i know what cat is bad?? Im not 100% sure but I think i may have heard him say like the 02 sensor after the cat???? IDK if that sounds right.
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Old 08-21-2007
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Quote:
Originally Posted by lifted97ranger
^^very possible......a plugged or plugging it would cause problems......

i would possibly look at the cat converter route........you have done just about everything else.....

have you ever installed a gasket in between the 2 intake manafolds and replaced the small rubber gaskets in the upper intake manafold? that could also be a problem.....i was getting a lean code and sure enought i had to install a gasket that wasn't there to begin with.......(also did it in my mom's '97 Explorer which the gasket wasn't there)



BTW: my offer still stands on my truck Shane
I do have a exhaust leak..............2nd
page at top https://www.ranger-forums.com/forum2...ad.php?t=47757
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Old 08-21-2007
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could very well be the exhaust leak causing it......also, it could be a bad 02 sensor....
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Old 08-21-2007
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I doubt it's the cat. And before I saw you mention the exhaust leak.. I was thinking it's either a vacuum leak or an exhaust leak.

I say fix the exhaust then clear the code.
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Old 08-21-2007
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Quote:
Originally Posted by lifted97ranger
BTW: my offer still stands on my truck Shane

My next job, depending on distance, and id i can offord to get a beater so i dont wear your truck down.....The deal is there trust me.
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Old 08-21-2007
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Quote:
Originally Posted by lifted97ranger
could very well be the exhaust leak causing it......also, it could be a bad 02 sensor....
Quote:
Originally Posted by wydopnthrtl
I doubt it's the cat. And before I saw you mention the exhaust leak.. I was thinking it's either a vacuum leak or an exhaust leak.

I say fix the exhaust then clear the code.
so try sealing up the exhaust up first.................one question if that is the answer..........how the heck can i get it togather without taking the manifold, and pipe out. As you can read on my link to my exhaust post, i had a electric impact and nothing...........also what messes me up is it's a DD!!!!
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Old 08-21-2007
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looks like maybe the egr tube is leaking, can you get a better pic of that.
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Old 08-21-2007
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Quote:
Originally Posted by fletch12518
P0174 (Too Lean) The guy told me it was in "Bank 2 after the cat" ............Idk.
He is WRONG.

P0174 is monitored by Bank 2, Sensor 1 which is the sensor upstream of the cats on the driver side. It says that the mixture on that side is so lean that the calibration cannot compensate for it without exceeding a calibrated limit.

A vacuum leak is your #1 suspect when you have a lean condition, especially on just one side of the engine. I would check the intake manifold to head gaskets which are known leakers on 4.0's. Also, if you have an exhaust leak upstream of that O2 sensor, it can cause it to report an incorrect A/F mixture to the PCM.
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Old 08-23-2007
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any ideas on how i can attack my exhaust leak???
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Old 08-23-2007
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weld it close...replace pipe...you could b super cheap an get a piece of metal an a big hose clamp an close it up like that but not a good idea...how big is it
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Old 08-24-2007
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I thought about welding it, but there is nooooooooooo way i can weld theside that is right next to the blck. there is no room!
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Old 01-02-2008
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ok took my truck to the exhaust shop. Got the leak fixed the 31st. And my check engine light is still on? Any ideas now?
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Old 01-02-2008
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pulled this off of AllData for ya hopefully it will help out.

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Old 01-02-2008
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all I can see is a red "x"
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Old 01-02-2008
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did you reset the code Shane? If you didn't it will still be on.....take the negative battery cable off the battery for about 10 minutes and see if that clears it...
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Old 01-02-2008
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Quote:
Originally Posted by lifted97ranger
did you reset the code Shane? If you didn't it will still be on.....take the negative battery cable off the battery for about 10 minutes and see if that clears it...
no i didnt, i was gonna see if it went out on its own. I'll do that than. Had it in the back of my mind. Ill let ya know.
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