What to do with a P0125 code

[nikkormat42]

Went out and bought the Equus ODB II code reader to troubleshoot a Service Engine Soon light.

It quickly returned the following.

P0125
Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control

Given this information what action should take first? This what a google search returned.

1 Open or short in heated oxygen sensor (bank 1 sensor 1) circuit
2 Heated oxygen sensor (bank 1 sensor 1)
3 Air induction system
4 Fuel Pressure
5 Injector
5 Gas leakage on exhaust system
6 ECM

Is there a good book or document someone could recommend to assist me in performing these 6 tasks? How can locate the (bank 1 sensor 1)?

[brooster]

Make sure the ECT/CTS (coolant temperature sensor) is plugged in properly and no wires are broken/shorted.

Clear the code and drive the vehicle for a day or two. If the code does not return, forget it for now.
If it does, have someone check/scan the computer, specifically the ECT for live data info. In other words, is it sending the proper information to the computer. This is usually an educated judgement based on what the mechanic sees on the scanner relative to current engine temp, ECT voltage, ambient air temp and other variables.

To do this yourself, you'll need a digital voltmeter and a chart to check the ECT voltage against the engine temperature to see if the ECT is changing as it should.

Since I don't have that information readily available, I might recommend you do a search for "testing the cts", "testing the coolant temperature sensor", or a variable thereof.

[GMMerlin]

Originally Posted by nikkormat42

Went out and bought the Equus ODB II code reader to troubleshoot a Service Engine Soon light.

It quickly returned the following.

P0125
Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control

Given this information what action should take first? This what a google search returned.

1 Open or short in heated oxygen sensor (bank 1 sensor 1) circuit
2 Heated oxygen sensor (bank 1 sensor 1)
3 Air induction system
4 Fuel Pressure
5 Injector
5 Gas leakage on exhaust system
6 ECM

Is there a good book or document someone could recommend to assist me in performing these 6 tasks? How can locate the (bank 1 sensor 1)?

First and foremost, check the condition of your cooling system...when I see this code, I check for a low coolant condition or a stuck open thermostat..usually on these vehicles its a leaking intake gasket!

[nikkormat42]

Thank you for the information so far. It is truly appreciated. I will examine as soon as I get home.

Should have included this earlier. It starts alright when cold and I can drive around the block. When I cut it off and try to restart it has problems. Finally after several tries it cranks and blows smoke from the tail pipe.

Hope this helps narrow it down somewhat.

[tophomesusa]

I've got the same code on my 99 Suburban. Recently the Tech at NTB told me that my water pump was leaking. I guess I should start there.

[skipr]

If you give me your e-mail address and engine VIN (probally a "R" or "T") and I will send you the complete dianogstic chart step by step procedure for that code.

[nikkormat42]

Yes. It turned to be a bad water pump and I had it replaced.

My problem now is that the passenger door has dropped. The handle is broke and the locking mechanism is getting mangeled. Any suggestions?

I can provide pictures.

[skipr]

Originally Posted by nikkormat42

Yes. It turned to be a bad water pump and I had it replaced.

My problem now is that the passenger door has dropped. The handle is broke and the locking mechanism is getting mangeled. Any suggestions?

I can provide pictures.

Interior handle or exterior? My exterior handle broke and the lock rod fell down into door.

[nikkormat42]

Its the interior handle that broke. Finally gave way from the locking mechanism get jammed.

Please look at my pictures.

http://www.jonmcintosh.org/photos/tahoe/Tahoe.html

Should I start a new thread for this topic?

[v10_viper]

Originally Posted by nikkormat42

Yes. It turned to be a bad water pump and I had it replaced.

My problem now is that the passenger door has dropped. The handle is broke and the locking mechanism is getting mangeled. Any suggestions?

I can provide pictures.

My suggestion is to obviously get it fixed. Go to your dealership if you dont mind spending money and buy a new hinge and locking mechanism, your pin there should be fine just looks like it got rubbed on a little bit, if you knew that the door was drooping then why didn't you fix it sooner??

[nikkormat42]

Originally Posted by v10_viper

My suggestion is to obviously get it fixed. Go to your dealership if you dont mind spending money and buy a new hinge and locking mechanism, your pin there should be fine just looks like it got rubbed on a little bit, if you knew that the door was drooping then why didn't you fix it sooner??

I would have fixed it immedialely but this is my girlfriends vehicle. I took it to the dealership and was quoted an astronical sum. I do metal work and was wondering if I could replace the damaged rings around the cylinders. Please give me suggestions as to where I can find a good parts website that might sale the little metal rings. I'll even settle for a site that sells the whole hinge and/or locking mechanism. The web sites I have found via google don't impress me much.

Thank you very much for your help! I am really tired of rolling down the window to get out of the car. Not to mention the thought of the door flying open while riding around.

Thanks,
Jon

[v10_viper]

Originally Posted by nikkormat42

I would have fixed it immedialely but this is my girlfriends vehicle. I took it to the dealership and was quoted an astronical sum. I do metal work and was wondering if I could replace the damaged rings around the cylinders. Please give me suggestions as to where I can find a good parts website that might sale the little metal rings. I'll even settle for a site that sells the whole hinge and/or locking mechanism. The web sites I have found via google don't impress me much.

Thank you very much for your help! I am really tired of rolling down the window to get out of the car. Not to mention the thought of the door flying open while riding around.

Thanks,
Jon

Hinge pin and bushings -http://www.1aauto.com/1A/DoorHingePins/ChevyTruck/BlazerFullSize/PLP1350405/35756

Door Latch - http://www.ckresto.com/ckresto.aspx

ckresto also has 7/16 and half inch strikes if you need those...hope this helps you...

Edit: also found hinge pins and bushings at ckresto