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Old 03-07-2012, 07:57 AM   #1
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New member w/engine issues

I'm a new member. Five year owner. Glad to be a part of the the forum family. I have recently ran across a new issue. I have a 97' TJ 2.5l. I recently had to change out the bank1 sensor1/upstream O2 sensor with an after market Bosch O2 sensor. Then i took it over to the dealership to do an overhaul and fix the crankshaft positioning sensor. After i got ripped by the dealership i drove it home and the check engine light came back on with a new code. When i checked it the code ended up being bank1 sensor1 picked up that the engine is running lean, P0171. Does anyone have any suggestions or ideas, it would be greatly appreciated. Thank you for your time.

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Old 03-07-2012, 09:05 AM   #2
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Got a volt meter or know someone with a super cool scan tool that can read real time voltage of the O2 sensors? My bet is that one is still bad...possibly both. Do you have any exhaust leaks or a cracked manifold?

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Old 03-07-2012, 11:12 AM   #3
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I've read on here before that jeeps don't care much for bosch sensors...no experience with it myself but perhaps someone else can comment?

When I'm home and not on my phone ill see if I can find the thread that was talking about the bosch o2 sensors.
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Old 03-07-2012, 02:32 PM   #4
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Thanx for the reply guys any info is better than what I have had. Anyone else on the Bosch O2 sensors???? or any other information would be great?
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Old 03-07-2012, 10:33 PM   #5
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Jeeps dont like Bosch, they like NTK/NGK which happen to be the OEM sensor.
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Old 03-08-2012, 07:17 AM   #6
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Jeeps dont like Bosch, they like NTK/NGK which happen to be the OEM sensor.
Thanx DevilDogDoc for that info.
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Old 03-08-2012, 07:19 AM   #7
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Got a volt meter or know someone with a super cool scan tool that can read real time voltage of the O2 sensors? My bet is that one is still bad...possibly both. Do you have any exhaust leaks or a cracked manifold?
I have a Scan Tool and it has real time do you know or anyone know what the voltage for the 02 sensors are suppose to be?
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Old 03-10-2012, 01:08 AM   #8
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Update: I replaced the 02 sensor, with a mopar 02 sensor then I turned off the check engine light, over an hour ago and took it for an hour long test drive. I noticed that my idle has improved and no check engine light at this time. I will post an update if it changes thanx again everyone for the information. You all rock.
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Old 03-10-2012, 11:30 AM   #9
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Originally Posted by jimmy86freedom View Post
I have a Scan Tool and it has real time do you know or anyone know what the voltage for the 02 sensors are suppose to be?
I normaly see 100mV to 800mV, it should be constantly fluctuating. If its slow and stays near one value then its bad. I see you replaced it, I would hook up the scanner and just keep a note of the values for future diagnostic. The down stream o2 will fluctuate slower adjusting your long term fuel trim, as the one you replaced adjusts the short term fuel trim. Any vaccum or exhaust leaks will screw with the readings.
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Old 03-11-2012, 06:42 AM   #10
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Thanx for the info StaffCaptainZ06, I appreciate it.
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Old 03-11-2012, 02:49 PM   #11
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Thanx for the info StaffCaptainZ06, I appreciate it.
No problem Jimmy!
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Old 03-22-2012, 06:52 AM   #12
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UPDATE: No problems with the Jeep. Replacing the Bosch with a Manufacture O2 cured the problem. (Problem P0171). Engine is no longer running lean in fact my mileage increased approximately 3-5mpg's or more. Thanx again everyone.
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Old 03-22-2012, 07:12 AM   #13
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First thing I learned here was to NOT buy Bosch sensors....Good info....However, expect to pop a code now n then that will clear itself....sometimes you might see a code that sez 02 sensor didn't heat up before ECU timed out...Hopefully, It won't put you in limp mode, and wil usually clear itself a few start cycles later.

P.S., you can get proper NKG/NGK sensors lots cheaper at Napa or Bumper to Bumper stores vice stealer...You need maybe to assist counter guy with cross ref info, tho...I'll post all 4 sensor part numbers once I find them...Was a stellar write up I think on jeepforum that I printed out and stuffed in my Chiltons, but it blew away.

I do remember that once I took sensor in and laid it on the counter we could match up wire lengths and connector then select proper NGK/NKG sensor, cause even Napa's book was wrong at the time.

Soon those four goofy sensors and super expensive manifold with twin mini cats will be history after I drop in a Chebby 5.3
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Old 03-22-2012, 03:22 PM   #14
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Old 03-23-2012, 12:37 AM   #15
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YES! That is where I got the sensor info. I cut n pasted it, then printed it out and stuffed it in my Chiltons. Thanks, I need to make a new copy and tape in the book this time
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Old 03-23-2012, 12:40 AM   #16
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At Napa, those Mopar #'s should cross to NKG/NGK. I suggest having old sensor with you to compare cable legnth and connector.

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