P0125 fault code e8 260

[steelinator]

My EML keeps coming on,

when I go into freeze frame live readings with my diagnostic the fault causing the light to come on is a P0125 coolant temp insufficient closed loop along with code P0170 fuel trim lean bank 1

The light seems to come on when driving along the dual carriage way at a constant speed 70 mph roughly 3000 rpm


Is this an issue with my o2 sensor ?

How can I check the o2 sensor using a multi meter?

 

[Simon@NTS]

Yes fuel trims can be associated with lambda control, monitor lambda voltage and it should fluctuate from 0.1 to 0.9 v, what's the fuel trims low and mid read ?

 

[steelinator]

My diagnostics wont give me fuel info

When I look at live readings for 02 bank 1 it goes from 0.000 to 0.040, but when I look at bank 2 which is not in the exhaust, just tied up under the car the reading is roughly 0.345

 

[steelinator]

So If I probe the signal side of the 02 when connected and vehicle running I should see 0.1-0.9v

 

[Simon@NTS]

So from what you've said bank1 is not reading anything

 

[Simon@NTS]

I would expect both to be fluctuating 0.1 - 0.9 v is there a de cat there

 

[Simon@NTS]

http://www.***************/forums/showthread.php?t=3418

 

[Simon@NTS]

The stars are geek.mapped.com take out the dot

 

[steelinator]

Is this an issue with my 02 or is it a mapping issue?

If I disconnect my o2 what voltage should I get from the loom side connector?

I get a 12 volt feed that would be the voltage for the heater side of the sensor should I see any voltage from the signal side or dose it have to be connected to see a voltage?

 

[steelinator]

Yeah it has a de cat, the bank 2 sensor is not in the flow of gasses, its still connected but tied to the body out the way and has been like that for 6 months now

 

[Simon@NTS]

I would say you have a dead O2 sensor pre cat, second sensor is out cause of the decat but fuel trim problem is caused by the lambda sensor IMO

 

[steelinator]

Will check the voltage at the signal side tomorrow

Thanks

 

[steelinator]

Fitted the new o2 sensor and problem sorted

Thanks your help

 

[Simon@NTS]

no problem mate

 

[And@fcm]

if you've removed the second lambda (even still connected but not in the exhaust) then it was throw this code it has to be disabled in the ecu by applying a heater patch

only way off removing with out getting the ecu done is to get a lambda simulator and plug that in to the cat connector instead

Andy