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Old 08-15-2019, 01:08 PM
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Codes ?

So this is probably a very amateurish question, but can my 2000tj throw a code without throwing a CEL? My 4.0 has been running great but she has 175k now and the other day I noticed a rough idle then I went to drive across town and CEL came on and I also started noticing studdering while accelerating. When I got back home I pulled the CEL code and had 2.5 so based on that replaced the IAC and idles great now.( The old IAC looked like a chunk of charcoal, it was bad). CEL went away and as stated idles great now but still stumbles when accelerating and found that out while towing a trailer
Thinking maybe a o2 sensor or TPS but just wondering if I can pull a code even if I no longer have a CEL? Thanks !

Btw has brand new iridium plugs from earlier this year.

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Old 08-15-2019, 06:50 PM   #2
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With a code reader (not odometer trick) can pull pending codes that have not crossed threshold to set a cel

May or may not have a pending code but need a reader or dongle in obd2 port to tell


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Old 08-15-2019, 09:48 PM
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Thanks for the help Digger84.So went and picked up a code reader and found pending codes for p0133 and p0171. Iím thinking upstream o2 sensor? I smell gas smell and am definitely getting poor gas mileage. I only see 2 o2 sensors on my Jeep, one upstream and one downstream.
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Old 08-16-2019, 08:43 AM   #4
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Upstream O2 sensor (closest to the manifold) will have the most affect on how the Jeep runs, I wouldn't worry about the downstream one yet. If you do replace it I would suggest using a NGK sensor
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Old 08-16-2019, 03:00 PM
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Quote:
Originally Posted by BM3 View Post
Upstream O2 sensor (closest to the manifold) will have the most affect on how the Jeep runs, I wouldn't worry about the downstream one yet. If you do replace it I would suggest using a NGK sensor


Awesome! Thanks for the info. I ordered one of the ngkís and itís supposed to come in Monday. Iíll repost if it solves everything.


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