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We just replaced the o2 sensor (upstream) due to loss of…

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we just replaced the o2...
we just replaced the o2 sensor (upstream) due to loss of power over 55 mph. test drove and it did great, but this morning it appears that the problem is back. Vehicle runs great until 55-60 mph. Suggestions please
Submitted: 2 years ago.Category: Kia
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Answered in 3 minutes by:
1/25/2016
Kia Mechanic: Jerry, Master Mechanic replied 2 years ago
Jerry
Jerry, Master Mechanic
Category: Kia
Satisfied Customers: 17,221
Experience: ASE Master certified, 30 years experience. Auto troubleshooting, electrical , ABS, SRS, EFI system
Verified

Hello and thank you for using the site. My name is ***** ***** I will be happy to assist you today.

.

Let me start by saying that any money that you paid, or if you have a subscription, that money stays in your account until the answers are rated, (positive) regardless of how fast or how long it may take to get finished. You can FOLLOW UP AT ANYTIME, even after rating.

.

You will want to check the fuel pressure to see if it is too low. Also that the filter is not restricting the flow of fuel.

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Then if the fuel pressure and flow are good, the exhaust may be a little bit restricted. You can have a back pressure test done on it at most exhaust shops to see if the cat is clogged.

.

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If they are both ok, then you will want to take a sample of the fuel to be sure that it’s not contaminated.

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Please don’t forget to rate the answer, **** THAT IS THE ONLY WAY I GET PAID **** if you need any more on it, I will be here.

.

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Kia Mechanic: Jerry, Master Mechanic replied 2 years ago

If you give me your email address, I can get the instructions for it and put it in a PDF file, (it is rather large) and send it to your email address for as little as possible.

.

You will just have to accept the additional service offer and ENTER your email address in the “ENTER CONTACT INFO” section so that I can see it, Thanks

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Kia Mechanic: Jerry, Master Mechanic replied 2 years ago

Please don’t forget to rate the answer in a positive way, . EVEN IF YOU HAVE A SUBSCRIPTION ****THAT IS THE ONLY WAY I GET PAID ****

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