bluedemon199

iTrader: (3)

i keep getting
P0172 System too rich
P0134 Heated Oxygen Sensor (Front) Circuit No Activity detected

i have replaced the front 02 with three different brand new sensors and it wont fix the problem what could be other causes/????
car is running at idle 11.8 on average on my afr

Tommyfacekicker

Anyone have any input?

Biggiesacks

inspect the wiring harness for damage.

bluedemon199

iTrader: (3)

wiring harness engine side or in side the cabin?

Biggiesacks

both, if you have a helper you can unplug the ecu and run a continuity test with a multimeter from the connector under the spark plug cover all the way to the pins on the ecu harness. A good visual before that could turn up your problem too.

bluedemon199

iTrader: (3)

thanks so much i did just put the transmission back in maybe i pinched something

bluedemon199

iTrader: (3)

if it is damaged do i need to replace the whole harness or jsut that connector/wire

Biggiesacks

I would recommend just repairing the harness. The only wiring you aren't suppose to repair/splice is the airbag stuff because the resistance tolerances are so tight and the risks are very high if something goes wrong.

bluedemon199

iTrader: (3)

i have not messed wit the harness is it a pain to replace?

Biggiesacks

the main harness would be a major pain to replace.

bluedemon199

iTrader: (3)

and im assuming the main harness is the one the front 02 connects to?

Biggiesacks

yup

bluedemon199

iTrader: (3)

guess i will start with engine side i already have intake and everything off will be looking tomorrow or tuesday. if its not the harness other suggestions?

Biggiesacks

https://www.obd-codes.com/p0134

code P0134 may mean that one or more of the following has happened:
Bad O2 (oxygen) sensor
Bad heater circuit in the O2 sensor
Wiring or connector to the sensor frayed / broken
Blown heater circuit fuse
Holes in the exhaust system
PCM failure

Those are apparently the causes of the P0134 code. I'll check the Service manual when I get a chance and see if it has any other guidance on this specific code.

bluedemon199

iTrader: (3)

Which fuse box would that be in ?