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Unread 02-07-2014, 03:23 PM   #1
ace4usmc
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Wj O2 Sensors - Spend $ on TSB fix or 2 new sensors?

Once again my WJ (04/4.0 w/50state emissions/Manufacture date Feb/03) has DTC's:

P0135 (M)
O2 Sensor Heater Circuit (Bank 1 Sensor 1)
Oxygen sensor heater element malfunction.

and

P0155 (M)
O2 Sensor Heater Circuit (Bank 2 Sensor 1)
Oxygen sensor heater element malfunction

I've replaced O2 sensors twice since I've owned her, the last time being about 3 or so years ago. Not wanting to spend the money again for new O2 sensors I poked around and found a TSB for erroneous DTC’s relating to a failure of the oxygen sensor heater on WJs built prior to June 02, 2003 and equipped with a 4.0L engine. The description seems to fit. It's made before 6/03 and I do occasionally start it up let it idle to warm it up in the mornings for my thermoregulationly challenged GF.

However, the dealer wants $120 just to hook up the DRBIII scan tool to see if it may have already done by the PO. If it does need it, they'll flash it without additional charges. But if it doesn't, I'm out $120.

My questions are:
Has anyone had the flash done and it did indeed fix their issue?
Should I see if I need flash/get done first or replace the two upstream O2 sensors first? Either way I could end up having to pay for both.


Last edited by ace4usmc; 02-07-2014 at 03:43 PM..
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Unread 02-07-2014, 03:46 PM   #2
ace4usmc
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It's also probably worth mentioning that need to get this corrected to pass emissions.
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Unread 02-07-2014, 03:52 PM   #3
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Quote:
Originally Posted by ace4usmc
It's also probably worth mentioning that need to get this corrected to pass emissions.
And to Get better mpg,,,
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Unread 02-07-2014, 06:11 PM   #4
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for $20 you can buy a Bluetooth OBDII adapter, leave it plugged into the jeep and read and erase those codes whenever you want, like before emissions test, using Torque a free AP for android phones
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Unread 02-07-2014, 06:24 PM   #5
jay-h
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If yours is covered by the flash, you could be just wasting your time by not doing it.

If it's considered an emission required fix, I believe (could be wrong) that they are required to do the fix at little or no charge.
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Unread 02-07-2014, 07:19 PM   #6
ace4usmc
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@ tomahawk
Better MPGs would be a plus.

@ migs
I already tried clearing the code with an ODB II reader when I was chasing an EVAP leak that I believe I have resolved. The shop said the couldn't do the emissions test because the OBD not had a chance to rerun it's checks.
(Side note: That was a free EVAP fix just cut 3/4in off the cracked hose and reconnected.)

@ jay
That would be great if I could get it updated at no cost. Now to search the web for a leg to stand on if I try to convince the dealer that I should not be charged for the update. Though, I can't say I'm optimistic, dealers aren't known to perform services on the house unless they have no other choice.
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Unread 02-07-2014, 07:41 PM   #7
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for $20 you can buy a Bluetooth OBDII adapter, leave it plugged into the jeep and read and erase those codes whenever you want, like before emissions test, using Torque a free AP for android phones
This will not help you pass inspections as the OBD system checks need to be complete, in which case the code may show up again.
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Unread 02-07-2014, 08:58 PM   #8
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Worth a shot to have it hooked up to the drb3. Look at it this way, $120 and it fixes your issue with a flash. $120 for new sensors that makes the issue go away again only to have it come back a few years down the road. Then you're spending money for the same thing again, and again.
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Unread 02-07-2014, 09:18 PM   #9
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Quote:
Originally Posted by Cirruslydakota View Post
Worth a shot to have it hooked up to the drb3. Look at it this way, $120 and it fixes your issue with a flash. $120 for new sensors that makes the issue go away again only to have it come back a few years down the road. Then you're spending money for the same thing again, and again.
I agree. Sounds like something that should be a recall(i.e. free), but since it isn't then yes it would save in the end by just biting the bullet now if that bulletin ends up being the source of your troubles.
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Unread 02-08-2014, 08:44 AM   #10
ace4usmc
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Thanks for the all of the input. Your right, it does make more sense to go ahead and get the flash done. Plus I found a dealer closer to where I work that only wants $99 to do the work.
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Unread 02-10-2014, 06:44 PM   #11
ace4usmc
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Well, it did need the update described in the TSB. Now to see it the dang thing stays off.
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Unread 02-13-2014, 12:50 PM   #12
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Thanks for the sound advise guys. Looks like the PCM flash from the TSB did the trick. The DTC's, which would normally be back on by now, have not reappeared.
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Unread 02-13-2014, 06:05 PM   #13
Cirruslydakota
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Most excellent. Glad we could help.
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