answersLogoWhite

0


Best Answer

P0171 and P0174 mean "fuel mixture too lean" on cylinder bank 1 and bank 2 respectively. Sorry I don't know what causes this. Looking at this same problem on 2000 Ford Taurus. Believe it is going to be in the HEGO (Heated Exhaust Gas Oxygen) Sensors. Bank 1 and 2 detecting too lean a condition. Yuck. Per the 1998 official Toyota shop manual for a Sienna, it could be a bad 1) coolant temp sensor 2) bad HO2S (or Fuel/Air sensors) 3) bad mass airflow sensor 4) restricted fuel somewhere (like the fuel filter in the tank! ouch.) First, check to function of the coolant temp sensor. You can pull it and play wiht your stove and boiling water or just buy a Carchip data collector and download the data to your computer to analyze. Second, before you replace that horribly expensive Mass Airflow Sensor, pull it out and *carefully* spray it clean with brake cleaner or an electronic cleaner of some sort. And do NOT touch any of the itty-bitty wires inside with anything or you WILL be replacing it. Third, if you have HO2S sensors, you can check the resistance of them using an multimeter to see if they are within spec. I forget exactly but it's something low like 9-12 ohms at 68F. If you have Fuel/Air sensors instead, it's dealer diagnostic time. Fourth, if you suspect fuel pressure or fuel flow issues, I recommend dealer diagnostic time too. My best friend got severely burned (2nd and 3rd degree on 50% of his body) messing with fuel and his VW bug when we were in high school. 25 years later, he is still covered in scar tissue and will be forever.

User Avatar

Wiki User

โˆ™ 2006-04-18 14:53:29
This answer is:
User Avatar
Study guides

Add your answer:

Earn +20 pts
Q: What are diagnostic codes P0171 and P0174 for a 2001 Sienna?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What are diagnostic codes P0171 and P0174 for a 2001 Cadillac?

Trouble code P0171 means: Fuel Trim System Lean (Bank 1) Trouble code P0174 means: Fuel Trim System Lean (Bank 2)


What do codes p0171 and p0174 mean?

p0171 andpo174 mean that you're car is running lean


04 GMC Sierra Codes p0171 and p0174?

Trouble code P0171 means: Fuel Trim System Lean (Bank 1) Trouble code P0174 means: Fuel Trim System Lean (Bank 2)


Trouble codes P0171 and P0174 on 1996 Ford windstar 3.8?

Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1) Trouble code P0174 means: Fuel System Too Lean (Cylinder Bank 2)


Fault codes 0171 and 0174 Ford Explorer sport?

P0171-system too lean bank 1 and P0174-system too lean bank 2


Check engine light comes on for your 2001 ford ranger XLT. When checked with diagnostic tool comes up with codes p171p174?

P0171 - system too lean ( Bank 1 ) - passenger side of engine P0174 - system too lean ( Bank 2 ) - drivers side of engine


What does computer codes p0171 and p0174 mean for 2002 explorer sport trac?

It means your vehicle is running lean you will need to replace the intake manifold gasket, as it is plastic and the seal wears out.


What does the codes P0171 and P0174 Mean when your engine light is on on my 2003 Ford Windstar?

Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1) Trouble code P0174 means: Fuel System Too Lean (Cylinder Bank 2) These 2 codes are common indicators of a well-known failure on the 1999-2003 Windstars. Be sure to review the additional information in the "Related Questions" below...


What is po174 and po171 dtc codes on a f250 v10 Triton?

P0171, system too lean (bank 1). P0174, system too lean (bank 2). Start with checking for a vacuum leak.


What do these codes mean diagnostic code P0171 and P0300 for Chevy truck 2004?

Trouble code P0171 means: Fuel Trim System Lean (Bank 1) Trouble code P0300 means: Multiple Cylinder Misfire Detected


Trouble codes P0171 and P0174 in a 2000 Chevy blazer?

Lean condition detected on banks 1 & 2 (left and right sides). Most commonly a dirty mass air flow sensor, or possible vacuum leak.


1999 ford 3.8 recent tuneup still runs rough what can it be?

Read through the "Related Question" that discusses a common problem with the Windstars and rough idle - check engine codes P0171 & P0174. That might be part of your problem too...

People also asked