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indy-tech, Import tech
Category: Toyota
Satisfied Customers: 7336
Experience:  Import technician .
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I have a 2004 RAV4 . The engine management light is intermittent,

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Hi, I have a 2004 RAV4 . The engine management light is intermittent, two,or three days on, two or three days off. The fault code is po171 , mixture lean. It has been looked at by two garages now, one says it's hard to get the software now to look deeply into it. All lambs sensors are new as is the mass air sensor. The car runs perfectly wether the light is on or off. Any help would be appreciated....joe
Name is***** goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back,

You need to get the car back on the scan tool, and check the fuel trims as this is looking like a problem with a vacuum leak .check for vacuum leaks .aftyer the MAF sensor to the manifold .
Exhaust leak befor the 1st sensor .

Low fuel pressure ,check your PCV valve ,replace if looks old and dirty ,also common issue for a P0171.

Bad injectors ??

The fuel ratio should be 14.7 / 1 thats air to fuel this is conytrolled by your already replaced MAF and o2 sensors so it leaves injectors fuel pressure or vacuum leak.

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Kind regards Greg
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Customer: replied 2 years ago.
Thanks Greg, I shall get your suggestions checked out. I've left you a small tip, sorry it's not more but I'm on disability, regards, joe
Hi Joe ,.
Thank you very much and wish you all the best, ***** ***** needed you can get back to me anytime with out any further cost .
Kindest regards Greg.