O2 sensors 02 ford explorer

70

Asked by Don Sep 08, 2019 at 12:05 PM about the 2002 Ford Explorer Sport

Question type: Maintenance & Repair

Started spitting codes out for O2 sensors,
replaced the 2 sensors that were bad and it
ran great for about 20 miles then started
doing same thing, then it spit out a new code
for another O2 sensor and replaced that one
and ran great again for about 15 miles then
started running crappy again. Only 1 last O2
sensor that hasnt been replaced and the
ones that have been replaced dont spit a
code. Never seen anything like this, any
ideas what the initial cause might be?

6 Answers

70

Jim thx so much for your help. I replaced the downstream sensor along with 1 upstream at the same time as code errors required, ran fine for a few as I mentioned, then replaced another upstream sensor as code error required and again ran fine for appr 15 miles then started sputtering again like its running out of gas and was able to limp it home at 4mph, it wouldnt go any faster. Engine light isnt on yet but it will be soon im sure so its not spitting any codes out. There is 1 last upstream that hasnt been replaced yet but something has to be causing these sensor issues. Put simply, as error codes for sensor are fixed it runs fine briefly, then another sensor code and fixed briefly again but always ends up running like its running out of gas. P1130, p1131, p1151 thank you again

2 people found this helpful.
70

Your the best Jim, thank you I have a direction now to start going in and checking those things off. Thanks again

1 people found this helpful.
70

Jim, one last thing if your still out there. Its not until the car comes up to temperature does it start running poorly and even then when in park it will idle fine and purr like a kitten. So the first few minutes it drives normal when cold.

1 people found this helpful.
70

Thank you so much, on it this morning. Hoping maybe its a leak in one of the lines, we'll see.

70

Well I dont get it. Runs ok 1st few minutes as I said then starts lerching forward like out of gas, limp it into driveway and idles @ 1000rpm perfectly, disconnect air intake just past MAF and car stalls immediately so i cant really try partially covering throttle body to test like you suggested or Im doing something wrong and check engine light has not come back on since replacing last O2 sensor and clearing codes. Do not have starter fluid or propane torch to check for leaks as I cant get to store right now, I did eyeball and felt around the lines but didnt see anything. Definitely fuel/vacuum issue. Just fyi, this all started with bad coolant temp sensor which I replaced then started throwing the O2 sensor codes after that, I really think it has a ton of life left in the engine, it ran perfect prior to all this and has only 89,000 miles on it, anyway truly grateful for all the help.

1 people found this helpful.
70

Well if anyone is wondering the final result here you go. If you have read the previous posts about the various O2 sensor issues Ive had and the lean codes, in the end two of the cats had burned up so I replaced those two and it runs better than ever now, thank you to Jim for all your help.

2 people found this helpful.

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