Best place to buy O2 sensors?

Stick with the OEM which is NTK who also makes NGK and Mopar Sensors... so any of those three brands would be fine. Steer clear of store-brand O2 sensors and especially avoid Bosch O2 sensors in a Jeep. Bosch is a good brand-name but their O2 sensors are set up for a different bias voltage than Jeeps provide so they are well known to not work properly.
 
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My jeep has 103,000 miles and I am trouble shooting a check engine light. my OBDii port is broken, previous owner must have kicked it. I am starting with O2 sensors and going from there. What other things might I check into?
 
Thank you. It show p-0440 code. Where do I start. It isn't the gas cap.

Go over every inch of vacuum hose especially any that run across the engine or the firewall. There should be a vacuum can under the battery and those hoses love to disintegrate and are hard to spot.

When I say go over I mean with your eyes and hands. Bend it and look for cracks.
 
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I get my NTK 02 sensors from Amazon. I only purchase through RA if I absolutely need to because their return process and customer service have been substandard in more recent years.
 
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Go over every inch of vacuum hose especially any that run across the engine or the firewall. There should be a vacuum can under the battery and those hoses love to disintegrate and are hard to spot.

When I say go over I mean with your eyes and hands. Bend it and look for cracks.

FWIW, my smoker device w/ compressed air quickly finds vacuum leaks. Saved me the headache of wondering if I found all of the leaks.
 
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Not Amazon...hit or miss they send you what you intended to order.

Rock Auto.

-Mac

I will reiterate this
NOT AMAZON or EBAY

Why?? Too many fake chinesium BS ones
If you dont leave a review within X time and it shits the bed outside the review window when most do, you cant warn others

Goto RockAuto, a reputable vendor

I couldnt even get SEM paints to honor a defective $25 can from Amazon
 
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