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Fault Codes


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Nbrown
New User

Sep 18, 2016, 12:37 PM

Post #1 of 5 (658 views)
Fault Codes Sign In

Vehicle:
2004
Ford Escape XLS
3.0L V6
150,0000 miles

The engine light is on. I checked the codes
This is what they are.

p0155, p2197, and p0174.

I ran seafoam fogger through the air intake and did the necesarry steps for that. Then unplugged the battery after. The engine ran great for about 10 miles and the light came back on. What's wrong and what steps can I take to correct the problem?


kev2
Veteran
kev2 profile image

Sep 18, 2016, 1:29 PM

Post #2 of 5 (647 views)
Re: Fault Codes Sign In

All o2 sensor codes Bank2 sensor 1
P0155 02 Sensor Heater Circuit Malfunction
P0174 System Too Lean (Bank 2)
P2197 Heated Oxygen Sensor (Bank 2 Sensor 1) Biased / Stuck Lean
The first code is a CIRCUIT issue and its the heater circuit. Lack of a warmed up o2 sensor might skew the other tests. I would start here.
Steps you can take
KOEO is there 12v on heater circuit?
Ideally you want to see the actually voltage the PCM is seeing.


Help us help you Why did you fog engine ? was it to correct the issue?


(This post was edited by kev2 on Sep 18, 2016, 1:39 PM)


Nbrown
New User

Sep 18, 2016, 4:47 PM

Post #3 of 5 (633 views)
Re: Fault Codes Sign In

Thanks. I can look into the KOEO reading.

Do those codes mean I need to replace the co2 sensors or that there is something else going on that I am using the KOEO reading for?

I fogged the engine to hopefully clean off any carbon on the co2 sensors.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 19, 2016, 5:23 AM

Post #4 of 5 (622 views)
Re: Fault Codes Sign In


Quote
I fogged the engine to hopefully clean off any carbon on the co2 sensors


That doesn't fix 0/2 sensors, it damages them further. There is no way to clean an 0/2 sensor.



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kev2
Veteran
kev2 profile image

Sep 19, 2016, 6:28 AM

Post #5 of 5 (616 views)
Re: Fault Codes Sign In

the KOEO will confirm if there is 12v at sensor...
Then we will check sensor heater ground and depending on those answers ohm sensor ...
As I said a o2 sensor heater failure MAY skew sensor readings...
then we will check the actual sensor output...






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