P0031, P0136, P0051 Check Engine Light - JeepForum.com
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post #1 of 4 Old 02-07-2009, 08:44 PM Thread Starter
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2003 WJ 
Join Date: Dec 2007
Location: Detroit
Posts: 2
P0031, P0136, P0051 Check Engine Light

Hey Jeep Forum users!

I have a check engine light on my Jeep, and it is throwing three codes:
P0136 - O2 SENSOR 1/2 Circuit Low Voltage

Could this be three bad sensors, or is this a larger problem. I know which sensors these are, but I do not believe that is the issue.

Thanks in advance!

Josh Vallender

SLFalcon is offline  
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post #2 of 4 Old 02-10-2009, 09:46 PM Thread Starter
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2003 WJ 
Join Date: Dec 2007
Location: Detroit
Posts: 2
SLFalcon is offline  
post #3 of 4 Old 02-10-2009, 10:23 PM
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1998 XJ Cherokee 
Join Date: Dec 2008
Location: alberta
Posts: 164
check your wireing. maybe u got a loose connection. do some google searches on your code. maybe your dirty cat converter is messing with your sensors. or replace the sensors and see what you get. idk shooting in the dark but those are the first 3 things id do.

-1998 cherokee xj limited.. current daily driver.
-1991 dodge w250 cummins.. old daily driver and regular tire burner
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post #4 of 4 Old 07-12-2010, 05:19 AM
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1997 TJ Wrangler 
Join Date: May 2009
Location: California
Posts: 321
first check a wire loom about an inch thick that rests on a stud popping out of the engine block. this stud can wear the loom and cause shorts. Inspect wiring closely.
these wires are towards the back of the motor near the firewall.
check if any o2 sensors have shorted out by wires touching the exhaust

if good then,

you need 2 upstream o2 sensors and 1 downstream sensor

p0051 &p0031 are upstream
p0136 is down

and check ecu for rust n stuff(wires)

peace brotha

4.0, 5sp, bfg33's, 3 1/2 lift
LKrux is offline  

02 sensor , oxygen sensor , p0031 , p0051 , p0136

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