02 sensors - CA emissions - JeepForum.com
 
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post #1 of 4 Old 08-19-2018, 08:58 PM Thread Starter
Motorcharge
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02 sensors - CA emissions

I'm probably tired and overthinking this, but are these all 4 o2 sensors for a 4.0 on a 99 with CA emissions?


Probably don't need to replace them all but at 280k miles it's probably not a terrible idea to replace all 4.


Throwing a P0171 code. Runs great, but idles like crap, black soot on the tailpipe and I'm only getting like 9-10 mpg.

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Originally Posted by Ron Swanson
There is no such thing as bad weather. Only inadequate clothing and transportation.
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post #2 of 4 Old 08-20-2018, 01:44 AM
Kolak
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You can see all the correct OE part numbers here:

http://www.wjjeeps.com/oxygen.htm

And you can see the list of fault codes here:

http://www.wjjeeps.com/faultcodes.htm

P0171 is "system too lean" and that could mean a lot of things including sluggish O2 sensors. You may also want to check fuel pressure and do a visual check of the sparkplugs to see if any of the cylinders look like there's mixture issues.

If the fuel filter and sparkplugs haven't been changed in a long time this would be a good time to do so.

If you do change the O2 sensors, I recommend genuine Mopar only. There are just too many issues with aftermarket sensors.

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post #3 of 4 Old 08-20-2018, 06:12 AM Thread Starter
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Already checked the other stuff. I'm not spending $400 on sensors for a $900 beater.

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Quote:
Originally Posted by Ron Swanson
There is no such thing as bad weather. Only inadequate clothing and transportation.
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post #4 of 4 Old 08-20-2018, 08:58 AM
Soem0
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You can find the mopar ones online for better prices than the stealership usually. You are running the risk of the new sensors. It working well if you use the after markets. Lots of vehicles are becoming more and more like this.
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