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Unread 02-22-2011, 07:44 AM   #1
2004freedom
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2004 WJ 
 
Join Date: Mar 2009
Location: long island
Posts: 51
P0135 O2 Sensor

hey guys, my 04 grand cherokee has been showing the annoying P0135 code. The guy from Jeep said it could be my software, O2 sensor heater circuit, or just my O2 sensor. So, I decided to attack the O2 sensor first because its the cheapest and easiest fix. When i went to order one from rockauto.com, it showed that there is an "upstream" O2 sensor and a "downstream" O2 sensor. How do I know which one to order? When I called Jeep and asked him he said "uhhh idk the scanner would tell me that"...so they really didn't help at all lol. Thanks for the help guys.

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Unread 02-22-2011, 07:52 AM   #2
JDJORGEN
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Location: Black Mountain, NC
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http://www.obd-codes.com/p0135

Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

So sensor Bank 1 means that it's the oxygen sensor on the same side as your number 1 cylinder and Sensor 1 means it's the upstream sensor on that side (the one between the exhaust manifold and the catalytic convertor)
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Unread 02-22-2011, 07:59 AM   #3
garthfan0523
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2003 WJ 
 
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Location: Manchester, NH
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Hi, freedom.

The P0135 code is specific to the Oxygen Sensor Heater Circuit Malfuntion (Bank 1 / Sensor 1 ).

The first thing you need to know is whether you have a 50-state emissions setup or 49-state emissions setup. You can determine this by crawling under your rig and having a look at the exhaust. If you have a single catalytic converter parked right next to your rear driveshaft with an O2 sensor behind it, then you have the 49-state setup. If you have two mini-cats up on the driver's side of your engine then you have the 50-state setup which means you also have four O2 sensors instead of only two.

If you have the single-cat setup, you will have one O2 sensor before the cat and one after. The P0135 would refer to the sensor BEFORE the cat.

If you have the 50-state setup, then this code will refer to the O2 sensor BEFORE the mini cat closest to the FRONT of the engine block.

Also, try a different mechanic. You don't need to scan to know these things....
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Unread 02-22-2011, 11:21 AM   #4
2004freedom
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ok thanks guys. so it would be an upstream and thats located before the cat? (in between the exhaust manifold and cat)? ive heard to stay away from anything but OEM bc the ecu for these jeeps are picky. is that necessarily true?
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Unread 02-22-2011, 02:46 PM   #5
silentbob21
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2004 WJ 
 
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they are 100% correct. upstream sensor (before cat) and if 50 state emissions ( two mini cats) its one closest to front of motor. id get ahold of kolak, he hooked me up with Mopar sensor for same cost of aftermarket one from autozone. quick and easy change
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Unread 02-22-2011, 02:47 PM   #6
silentbob21
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and if you dont know who Kolak is... hes a member on the forum, find him shoot him a PM or email he will hook you up. $55 ish IIRC

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Unread 02-23-2011, 02:04 AM   #7
garthfan0523
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I just realized, you have an '04.

There is a TSB regarding the O2 Sensor Heater Circuit Malfunction DTC that was released for '04 models built prior to June 02, 2003. Apparently, there was a timing parameter error in the PCM software that caused false MIL illuminations.

If your rig was built before the above date, you are probably fine and just need to have the PCM flashed with the upgraded software. This is done at a dealership or garage with access to a DRBIII scan tool and the correct software.
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Unread 02-23-2011, 04:05 AM   #8
dafox
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Location: Kankakee, illinois
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Make sure he checks all of the fuses... For me, one of my fuses was blown. The ten amp one under the hood. I replaced the o2 sensors first... then replaced that fuse with a 20 amp instead of a 10 amp.
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