Toyota Sienna Check Engine P0171- SOLVED

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Toyota Sienna Check Engine P0171- SOLVED

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Learn how to solve a 2008 Toyota Sienna Check Engine Code P0171 - Bank 1 Sensor 1 Stuck Lean. It's not as complex as you might think. Here's a hint...check this simple-to-access part before you dive too deeply into troubleshooting.
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@vistablue2984 6 ай бұрын

Good analysis on the case here where it is only the one bank! It’s frustrating that everyone suggests the MAF sensor, fuel delivery, fuel filter and such which should impact both banks, not just one. And it seems that too many people are quickly blaming the code on the upstream bank one O2 sensor, which seems like “shooting the messenger” instead of pursuing the actual problem.

@ScottyWrenches 6 ай бұрын

Yep, even when you go to reputable mechanic or the dealer, it can seem like they fire the "parts-cannon" first, then trouble shoot second!

@vistablue2984 6 ай бұрын

Did you use any thread sealant with the new PCV valve? Is it required?

@ScottyWrenches 6 ай бұрын

@@vistablue2984 no thread sealant required on the PCV valve

@nmartin5551 3 ай бұрын

Definitely enjoyed video and found info helpful!

@ScottyWrenches 3 ай бұрын

Glad you found it helpful!

@gregjohnson1709 10 ай бұрын

I've been battling that exact code for weeks. I checked my pcv valve, cleaned it out and it rattles fine, but I bought another one because they are so inexpensive. No matter what end I blow on or suck on simulating a vacuum, I never get a perfect seal. This is a grand voyager v6 3.3 1997. Just how air tight should they be? The new one is a mopar genuine oem. I was expecting the same result as sucking on a straw with my finger plugging the other end- no air coming through at all.

@ScottyWrenches 10 ай бұрын

PCV is a one way valve. Air should move toward the vacuum hose and NOT the other way.

@mhazzard7282 10 ай бұрын

Going where others don't go...

@willpage79 8 ай бұрын

I got p0171 and p0174 should i change the pcv valve?

@ScottyWrenches 7 ай бұрын

Having both codes means your engine is lean on both front and rear banks. Chances are you have an air leak somewhere between the air filter and the throttle body. My guess would be that one of the black rubber air intake hoses is cracked...the one closest to the throttle body, as that is AFTER the mass air sensor, so that's where you would get "unmetered air" into both banks. But for the extra $10, I'd say do the PCV valve while you're at it (especially if you haven't already replaced PCV)

@jordanomoto4135 4 ай бұрын

Any idea for this. I have a 2014 sienna 140k miles. Replaced MAF 2 times and now P0171 and P0174. Would replacing this part fix both codes? Or you think it’s the O2 sensors?

@ScottyWrenches 4 ай бұрын

It's more likely you have an air leak after the MAF sensor. Check the rubber intake tubing between the MAF and throttle body. That's just my guess with the next on the list to trouble shoot.

@amediocre5028 2 ай бұрын

What were symptoms on the car? Any longer cranks to start the car?

@ScottyWrenches 2 ай бұрын

Van ran fine...no misfires or hesitation. It just had the CEL code. The trouble is that the computer could no longer fix the fuel mixture within the factory parameters, which sets off the code.