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Thomas
Thomas, Mechanic
Category: Jeep
Satisfied Customers: 1543
Experience:  Tech for 15 years owned 5 Jeeps myself
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2002 Jeep Wrangler: The check engine light is..coil..rail..o2 sensors

Customer Question

I have a 2002 Jeep Wrangler - The check engine light is on - codes p0171 & p0174. We replaced the plugs and coil/rail along with all 4 o2 sensors. those codes are still there but now we have po155,po161,po031 &p051. Help!!!
Submitted: 6 years ago.
Category: Jeep
Expert:  Thomas replied 6 years ago.

Thomas :

Hello and welcome to Just Answer! I will do my best to help you fix your Jeep problem today.

Thomas :

Have you checked for a vacuum leak?

Thomas :

Also is it 6cyl or 4cyl?

Thomas :

P0031-1/1 O2 SENSOR HEATER CIRCUIT LOW

Thomas :

P0051-2/1 O2 SENSOR HEATER CIRCUIT LOW

Thomas :

P0155-2/1 O2 SENSOR HEATER FAILURE

Thomas :

P0161-2/2 O2 SENSOR HEATER FAILURE

Thomas :

It sounds like you got the wrong O2 sensors. Does the engine still run?

Thomas :

Or you mixed up the O2 sensors

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Thomas :

You have a code for 3 of the 4 O2 sensors the only one missing is sensor 1/2. So sensor 1/2 must be correct.

JACUSTOMER-npicd1os- :

Jeep is running rough - 6 cyl

JACUSTOMER-npicd1os- :

We did check for vaccum leak - the garage repair it and 2 days later the codes popped back up

JACUSTOMER-npicd1os- :

I double checked and being told that they are the correct sensors. Where do we go from here

Expert:  Thomas replied 6 years ago.
I am getting no reply, we can pick this up whenever you like.
Expert:  Thomas replied 6 years ago.
I would check the O2 sensor with the part # XXXXX see if yours are in the right location. You could also just be using bad parts. I highly recommend dealer parts when it comes to engine electrical parts...
Expert:  Thomas replied 6 years ago.
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