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Unread 09-22-2014, 11:16 AM   #1
2003cherokee
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2003 WJ 
 
Join Date: Jul 2011
Location: Oklahoma city, ok
Posts: 21
Need help with O2 sensors. Just a few questions.

Mine is a 2003 with the 4.7 liter V8.

Just got the PO161 code when I had the idiot light checked.

Parts store said it is the downstream sensor.

Checked on Rock Auto for the sensors, but don't know which brand to get.

Mechanic that was in the store, overheard and told me to change both sensors. But I think I have all four (Cali emissions), so do I change them all?

And do I need to buy the removal tool to remove them and what does it look like or what size for my jeep?

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Unread 09-22-2014, 08:16 PM   #2
Gerber54
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2001 WJ 
 
Join Date: Aug 2010
Location: Omaha, Nebraska
Posts: 8
If more than one is bad it should show a separate engine code. I got the Denso ones from rock auto and the check engine light was back on within a week. There are a few threads on here that suggest using Bosch or Mopar ones only. From what I have read the Bosch ones will last a few months before the light ends up back on.

As for tools they make a few different styles of O2 sensor wrenches. The sensors are on top of the exhaust and are really hard to get at with a regular wrench. Having a removal tool is going to save you a lot of frustration. I am pretty sure 7/8 is the standard but it could vary by manufacture so double check with whatever you end up purchasing.
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Unread 09-22-2014, 08:39 PM   #3
HighOutput
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2003 WJ 
 
Join Date: Jun 2012
Location: Red Centre, NT
Posts: 102
Denso sensors from RockAuto or buy Mopar.

They look like spark plugs sticking out of the exhaust, so follow the exhaust to see if you have 2 or 4. Then hit it with PB Blaster as they're usually on there pretty darn tight.

Click on the link for different types of sockets.

I use this one and hit the handle with a hammer and or attach a breaker bar. (I've hit it hard and hasn't broken yet)

P.S Whether you have 2 or 4 it won't hurt to the buy the whole set. Just change if it's throwing a code or just change them all out for experience and exploration purposes

But DO NOT cut the wires unless you are sure you have the correct part. They have different lengths of wire and the harness plugs are not all the same.
02sensor1.jpg

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Unread 09-22-2014, 08:44 PM   #4
ezflip
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2002 WJ 
 
Join Date: Oct 2008
Location: Michigan
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Only buy Mopar. The universal replacements on Rock Auto are not guaranteed to meet the tight tolerances our Jeeps require.
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2002 Overland - 4.7 HO, "Select-Drive", 4" RC long arms, TAG front winch bumper, 32" BFG KM's, Kolak 3" exhaust, Flowmaster 50 series


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Unread 09-22-2014, 08:58 PM   #5
HighOutput
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2003 WJ 
 
Join Date: Jun 2012
Location: Red Centre, NT
Posts: 102
Rockauto parts for 02 sensor and 02 sensor removal socket
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