P0174 HELP!! Only bank 2!
02-23-2019, 01:15 AM
#1
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P0174 HELP!! Only bank 2!
I have a 2000 F-150 4.2 V6 SuperCab with only 108,000 miles on it. The only problem with it is I have a reoccurring code. P0174 System too lean bank 2, I have looked at other threads and they are all for both banks but mine is consistently only BANK 2, no matter how many times I delete it, it’s always bank 2 when it comes back. I have checked all my vacuum lines, they’re good. I have replaced the PVC valve and joint on the top. I have sprayed mass airflow cleaner on the MAF sensor and it still comes back, I have ran 93 octane through it and no change. I have seen where rock auto sells a PVC valve grommet, is this a necessity or what? Mine didn’t have it when I replaced it so I didn’t get it. Could this cause it? And only one bank? I have had it where the code shows up twice, same bank 2 but only 2 of the exact same codes. I am unsure of where to go from here. Any help would be great.
02-23-2019, 03:29 AM
#2
I have a 2000 F-150 4.2 V6 SuperCab with only 108,000 miles on it. The only problem with it is I have a reoccurring code. P0174 System too lean bank 2, I have looked at other threads and they are all for both banks but mine is consistently only BANK 2, no matter how many times I delete it, it’s always bank 2 when it comes back. ... Any help would be great.
02-23-2019, 09:49 AM
#3
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Thread Starter
Something to check, I had a P0171 Bank 1 code that kept getting set. Turned out it was a loose connection of the exhaust pipe at the manifold on the passenger side. Tightened the nuts about a half turn and it hasn't come back. I think a vacuum leak before the intakes valves would eventually set both bank lean codes. A leak after an exhaust valve can apparently cause a single bank code. The small exhaust pipe leak must have allowed air to be sucked into the exhaust causing the lean code. I would have guessed the exhaust pressure would not do that. If a small leak in an exhaust pipe connection before the cats can do that maybe a crack in a manifold could, too.
02-23-2019, 10:07 AM
#4
I have bought that could be it, however I’m my specific vehicle do you know what side bank 2 is? I do not, keep in mind it is the 4.2 V6. I no longer have the sticker above the radiator fan shield/heat shield, so I don’t know where to get it. I will definitely try that and update you on my progress.
02-23-2019, 10:09 AM
#5
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02-23-2019, 06:24 PM
#7
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02-23-2019, 07:02 PM
#8
I wouldn't expect injector cleaner to help much if any if there is a large enough blockage to cause a lean bank. I would be more concerned that something large got past a cheap fuel filter and is blocking the screen in the top of an injector.
I recently had a lean bank 1 that turned into a miss. The scanner showed an intermittent injector that eventually failed completely. It all cleared up after replacing the injector. But you need a scanner to see what is going on and a fuel pressure tester to make sure your pressure is right.
It is also possible that you have an O2 sensor on it's way out giving a false reading that you are too lean on that bank.
02-23-2019, 10:50 PM
#9
Senior Member
Thread Starter
93 octane will help stop knocking, but doesn't usually contain any extra detergents.
I wouldn't expect injector cleaner to help much if any if there is a large enough blockage to cause a lean bank. I would be more concerned that something large got past a cheap fuel filter and is blocking the screen in the top of an injector.
I recently had a lean bank 1 that turned into a miss. The scanner showed an intermittent injector that eventually failed completely. It all cleared up after replacing the injector. But you need a scanner to see what is going on and a fuel pressure tester to make sure your pressure is right.
It is also possible that you have an O2 sensor on it's way out giving a false reading that you are too lean on that bank.
I wouldn't expect injector cleaner to help much if any if there is a large enough blockage to cause a lean bank. I would be more concerned that something large got past a cheap fuel filter and is blocking the screen in the top of an injector.
I recently had a lean bank 1 that turned into a miss. The scanner showed an intermittent injector that eventually failed completely. It all cleared up after replacing the injector. But you need a scanner to see what is going on and a fuel pressure tester to make sure your pressure is right.
It is also possible that you have an O2 sensor on it's way out giving a false reading that you are too lean on that bank.