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Unread 05-14-2012, 06:29 AM   #1
vXxo0oxXv
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Join Date: Mar 2012
Location: Meriden, ct
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2005 Liberty p0038 code- Already replaced sensor

Hey guys,

I'm still getting a p0038 code after replacing the drivers side post cat o2 sensor. It's a Bosch sensor that I got from NAPA.

I guess the code means theres a high voltage on the heater element, so I'm thinking maybe there's an open in the harnass.

I have a meter, but I don't know where the other end of the connections for the heater element terminates. I dug through the FSV looking for pinouts, but I couldn't find them.

Any help is appreciated.
Thanks

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Unread 05-14-2012, 06:40 AM   #2
streetglideok
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2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,346
Bosch aftermarket O2 sensors are known for being junk in the repair industry. NTK or OE is about the only reliable source for sensors. I would check for power to the O2 sensor heater on that side, among other things. If you look at the O2 sensor, usually there are two white wires, a grey, and a black. The two white wires are the power and ground for the heater. Figure out what color that connect to at the connector.
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Unread Today, 04:34 PM   #3
vxxo0oxxv2
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After 3 years, finally got this resolved

Turns out it most likely was that heater element in the Bosch sensor. Probably wasn't within the resistance specification. I replaced it again with the OEM sensor, and now the light is gone. I was ****ting bricks at first though. The code didn't clear, even after a battery disconnect/reconnect. After a few starts and letting it run, it went away though.

Hope this helps someone else.
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Unread Today, 04:40 PM   #4
95BadBoy
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Looks like that was a 2 year fix. Glad to hear things are up and running.
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Unread Today, 06:03 PM   #5
tjkj2002
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2002 KJ Liberty 
 
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Quote:
Originally Posted by vxxo0oxxv2 View Post
After 3 years, finally got this resolved

Turns out it most likely was that heater element in the Bosch sensor. Probably wasn't within the resistance specification. I replaced it again with the OEM sensor, and now the light is gone. I was ****ting bricks at first though. The code didn't clear, even after a battery disconnect/reconnect. After a few starts and letting it run, it went away though.

Hope this helps someone else.
And why you never use a bosch O2 sensor.
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