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Old 07-16-2013, 12:28 PM   #1
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2003 Sport O2 Sensor Woes

Okay, so I have been running this Heep for about a month now. I have had all sorts of codes being thrown, all air-related. Usually the same ones. I have replaced:

• both upstream O2 sensors
• both downstream O2 sensors
• ruined, oily AIRAID CAI (with completely stock system)
• plugs (coil pack was okay, plugs were in horrible shape)

Chapter 1

I get the P0171 and P0174 codes most of the time. I clear them off and they come right back. But the CEL occasionally goes off on its own for a few days. In such a case I check and clear the codes. After a day or two more the CEL comes back on with the same first code and frequently the same second code. Both indicate a lean condition, forcing the motor to run rich.

BUT I GET 17 TO 19 MPG ON THE HIGHWAY AND INTERSTATE!!!

So if I am running rich due to the computer I *should* be getting bad mpg numbers, but they are better than when I bought the thing.

I decided to check to see whether the dealership installed Bosch sensors as I have been told that these could confuse the computer.

Chapter 2

I get to the dealership yesterday to pick up some parts I am installing this week. I inquire as the the brand of the four sensors they installed.

A lot of chit chat happens at the parts desk. Service Advisor (whom I trust a lot after none years of working with her) says that OEM would have been (most likely) NTK but that since these are no longer produced and DC seems to love Bosch right now that the replacements are most likely Bosch. They have had no complaints about them, but they do not replace all four on a 2003 jeep all that often, so I think the "no complaints" is just a lack of examples for this specific fix - maybe.

She said the parts guy told her that all of them come in Mopar-branded and that there is no way for them to tell who actually made the part. But he also suspected they were probably Bosch based on looking at them.

Apotheosis

With a normal 17 mpg highway over five tanks of gas, could this simply be the computer and the sensor not liking one another, that my jeep is actually running just fine? Power and acceleration are fine (for 3.73s with 33x12.5s) and mileage is great (for a jeep).

Appendix

I am assuming that the downstream ones really do not matter, brand-wise. I am also assuming that I need to purchase actual NTK-branded sensors online somewhere and install them myself, writing off the expense of the first ones as an "Idiot Fee" for paying someone to do easy work like this when I could have done it myself.

Sound about right?

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2003 Shale Green TJ Sport
2013 Black JK Sport S
The terms "PO" and POS" are interchangeable when referring to the guy who used to own my TJ.
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Old 07-16-2013, 12:33 PM   #2
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Sounds spot on! Bosch sensors do not perform well in TJs. rockauto.com will have all the sensors for the cheapest option. Here is a discount code for you to use and the instructions for using it

code= 1574541712895315
Using Your Discount Code

Enter the code above in the "How did you hear about us" line of the shopping cart. If you are using our traditional HTML catalog, please click the "Apply" button to the right of the field. Your discount will automatically appear, subtracted from your parts order total. Orders using discount codes must be placed online. Phone orders are not eligible for discounts.

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Old 07-16-2013, 12:41 PM   #3
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Thanks, Sarge! (From a former Sp4)

Will this discount apply until the End of Time or is this a limited time sale? I will be too broke to get these until the 30th...

With that in mind, is there any way for me to absolutely confirm that mine are Bosch?
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2003 Shale Green TJ Sport
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The terms "PO" and POS" are interchangeable when referring to the guy who used to own my TJ.
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Old 07-16-2013, 12:44 PM   #4
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Quote:
Originally Posted by Holton345 View Post
Thanks, Sarge! (From a former Sp4)

Will this discount apply until the End of Time or is this a limited time sale? I will be too broke to get these until the 30th...

With that in mind, is there any way for me to absolutely confirm that mine are Bosch?
HOOAH thanks for your service! That code expires 25 August. I just made another order this past weekend so will likely be getting another one soon. Let me know if you can't order before 25 August and I will get ya another one. And other than looking at the sensor and running numbers I'm not sure. I know mine was Bosch and had a orange covering over the wiring harness. Not to say this is the case with all Bosch sensors though.
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