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Old 01-04-2021, 12:35 PM #31
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Originally Posted by clanofwolves View Post
I will on the O2s... I do some seafoam cleaning of the TB and I spray cleaner into the IAC when I am cleaning the MAF (the right brass screw is removed with a vice grip as the first attempted removal found her not budging, haha). I haven't paid an overwhelming amount of attention to the IAC, save I just insure she moves easily.

I pull the lower idle assist hose off the IAC and spray in there until no black chunks are visible in the inlet to it.


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Old 01-06-2021, 12:13 PM #32
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Quote:
Originally Posted by LittleCaesar View Post
At least with the preliminary data, not a vacuum leak and probably not a direct fuel problem. Most likely an aging sensor. Post the new data once you have it.
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I would replace the oxygen sensors
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+1 on changing out the 02 sensors.
What is the best brand (other than OEM) that you guys have had good luck with?
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Old 01-06-2021, 12:50 PM #33
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Denso....
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Old 01-06-2021, 01:29 PM #34
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I replaced mine with Denso
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Old 01-06-2021, 01:39 PM #35
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NTKs work also


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Old 01-06-2021, 03:49 PM #36
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Been using the same Densos since 2009 with zero problems......
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Old 02-11-2023, 12:00 AM #37
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Exclamation

Hi everybody, I'm new to the forum trying to diagnose a P0171 code on my (new to me) '01 SR5.
So far, I've solved my P1135 & P0420 codes by replacing both O2 sensors with Denso.
For the unsolved P0171, I tried cleaning my MAF but the code returned. My next task was gonna be to check for a vacuum leak. Not sure if there's any common things I'm missing or could try? Thanks in advance for any input.
i recently bought the truck and the dealer didn't disclose multiple check engine codes so I'm hoping this is an easy fix

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Old 02-11-2023, 09:48 AM #38
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Quote:
Originally Posted by Grizzly Be4R View Post
Hi everybody, I'm new to the forum trying to diagnose a P0171 code on my (new to me) '01 SR5.
So far, I've solved my P1135 & P0420 codes by replacing both O2 sensors with Denso.
For the unsolved P0171, I tried cleaning my MAF but the code returned. My next task was gonna be to check for a vacuum leak. Not sure if there's any common things I'm missing or could try? Thanks in advance for any input.
i recently bought the truck and the dealer didn't disclose multiple check engine codes so I'm hoping this is an easy fix
One toyota website suggests vacuum leaks like you're saying, but it also goes on to say that it could be a leak in the PCV hoses or even the valve itself.

If you replace the PCV valve, make sure you get a new grommet to go with it and take your time. Get it from Toyota, they are inexpensive. Have needle nose pliers on hand in case it begins to crumble and you get bits down
in the hole it comes out of.

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Old 02-12-2023, 03:30 PM #39
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Quote:
Originally Posted by JoeT4R View Post
One toyota website suggests vacuum leaks like you're saying, but it also goes on to say that it could be a leak in the PCV hoses or even the valve itself.

If you replace the PCV valve, make sure you get a new grommet to go with it and take your time. Get it from Toyota, they are inexpensive. Have needle nose pliers on hand in case it begins to crumble and you get bits down
in the hole it comes out of.

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Get or find someone with a smoke machine. It'll save you a lot of time and money.
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Old 02-12-2023, 05:10 PM #40
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Get or find someone with a smoke machine. It'll save you a lot of time and money.
This too!

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Old 02-18-2023, 10:12 PM #41
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Question

Mechanic didn't detect a vacuum leak. Changed the MAF (new Delphi) and also replaced the PCV valve+ gasket.
CEL stayed off for about 100 miles and then popped back on. P0171. O2 sensors are new as well. Any other suggestions? I'll try to get a smoke test done soon if that's my only option besides the fuel filter..
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Old 02-19-2023, 08:02 AM #42
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Quote:
Originally Posted by Grizzly Be4R View Post
Mechanic didn't detect a vacuum leak. Changed the MAF (new Delphi) and also replaced the PCV valve+ gasket.

CEL stayed off for about 100 miles and then popped back on. P0171. O2 sensors are new as well. Any other suggestions? I'll try to get a smoke test done soon if that's my only option besides the fuel filter..
Fuel filter is an inexpensive fix. OEM filters go for about $40 iirc. If the inlet and outlet nuts aren't rusted on yours I'd suggest doing it yourself, it's not a hard job as long as the nuts can thread easily. Perhaps give that a shot, especially if it's never been done on your truck before and report back. If you need the p/n let me know.

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Old 02-19-2023, 10:10 AM #43
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If the fuel filter doesnít fix it look for cracks on the intake tube between the MAF sensor and the throttle body.


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Old 02-19-2023, 07:33 PM #44
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Thanks y'all. Will report back in the near future.
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Old 03-14-2023, 02:23 PM #45
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Thanks y'all. Will report back in the near future.
Any further updates on this? My rig is now having the P0171, even after clearing the code three times now with my ScanGauge.

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