P0125 error code ML V6

P0125 error code ML V6

Postby Newtron on Tue Nov 20, 2018 9:14 am

Hi there,

New member here chasing some sage advise. My 2007 3.5 V6 ML Triton is producing a P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control) error code. It appears to occur on longer runs at about 40 minute mark. On shorter drives it doesn't appear and will actually clear its self after a few cycles of shorter trips. Triton seems to run fine when Check Engine Light (CEL) is on.

I've ordered a new Engine Coolant Temp (ECT) sensor and hope this will be the solution. Anyone else experienced this and better still found a solution?
Last edited by Newtron on Tue Nov 20, 2018 2:45 pm, edited 1 time in total.
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Re: P0125 error code

Postby Newtron on Tue Nov 20, 2018 1:20 pm

More info. After warming up the dash board temp gauge reads steady at around half way or just over.

Another question. Do I wrap some Teflon tape on the new ECT or leave it bare - read advise to do both??
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Re: P0125 error code ML V6

Postby Newtron on Wed Nov 21, 2018 7:32 am

Update.

Put the new ECT sensor in yesterday with no sealant tape or paste and so far no leaks following a 10 minute test run and a 50 minute school run (I know right :roll: ) this morning. Best result though is no CEL so far.
Fingers are remaining tightly crossed and the best test will have to wait till next week when I can try a few hour long freeway journeys.
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Re: P0125 error code ML V6

Postby NowForThe5th on Wed Nov 21, 2018 10:43 am

Hope it's fixed for you.

How good are those V6's? This must be about the third time that anyone's had an error code on an ML V6. I had just two in 5 years - one when the ABS unit self destructed and one when the apprentice filled the spark plug recess with water. Engine still ran, with just an occasional hiccup.
Chris

If work is so terrific, why do they have to pay us to do it?
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Re: P0125 error code ML V6

Postby Newtron on Wed Nov 21, 2018 2:01 pm

NowForThe5th wrote:Hope it's fixed for you.

How good are those V6's? This must be about the third time that anyone's had an error code on an ML V6. I had just two in 5 years - one when the ABS unit self destructed and one when the apprentice filled the spark plug recess with water. Engine still ran, with just an occasional hiccup.


Thanks for the replay. I haven't had this beast long but did a fair bit of reading prior to buying a second hand 4x4. I initially thought a diesel would be the go but after reading about the more rigorous maintenance required on modern diesels and the relative reliability on the V6's (other brands included) my preference swung the way of the V6.
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Re: P0125 error code ML V6

Postby Newtron on Sat Dec 01, 2018 1:20 pm

Update.

P0125 is back :( after about 45ks on a freeway trip today.

Not sure I want to start replacing the thermostat as surely the actual engine coolant temp isn't actually too low at 45kms into a drive on a 32 degree day? From reading the limited number of similar stories I can find where thermostats were replaced the P0125 CEL has persisted.

I've also read on another site to try replacing O2 sensors??
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Re: P0125 error code ML V6

Postby dwhylan on Fri Dec 07, 2018 9:19 am

This is from the manual:
P0125* Feedback system Oxygen sensor not operating, engine warning lamp ON.
Page reference:
M213200900085900ENG

PROBABLE CAUSES
•Failed oxygen sensor (front)
•Harness damage in oxygen sensor (front) circuit or loose connector contact
•Failed oxygen sensor (rear)
Page reference:
M113175240046700ENG
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Re: P0125 error code ML V6

Postby Newtron on Sat Dec 08, 2018 3:25 am

dwhylan wrote:This is from the manual:
P0125* Feedback system Oxygen sensor not operating, engine warning lamp ON.
Page reference:
M213200900085900ENG

PROBABLE CAUSES
•Failed oxygen sensor (front)
•Harness damage in oxygen sensor (front) circuit or loose connector contact
•Failed oxygen sensor (rear)
Page reference:
M113175240046700ENG


Thank you so much for the above. I've been questioning whether or not to try replacing the O2 sensors as they're expensive little suckers. Will definitely give it a shot and report back.
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