Scotty got a 2011 toyota sienna LE with the 3.5 v6 almost 170,000 miles occasionally after driving it once it cools down for a few hours when you go to restart it van will have a bit of extended crank not real long but, cranks longer than what it should be. It is a highway vehicle drove over 100 miles daily to my knowledge its never had any fuel system service performed on it or throttle body cleaning I have since this issue has been happening put at different fill ups a bottle of stp complete fuel system cleaner in it and the issue will go away for a couple of tank fuls or so then return again. Its kinda of aggravating to me as when I bought the van used at 95,000 miles it did not do this. Cold starts after sitting overnight of a morning it starts fine. It does currently have a code P0057 for the bank 2 sensor 2 heated oxygen sensor low system circuit voltage would that be a player in causing an extended crank. Van rans fine otherwise. I am looking for tips or what I should do to proceed to see about correcting this if I can. Thanks in advance and sorry for such a long post. Anyone else with any ideas or anything feel free to comment.
I know I did some research when this P0057 first happened it apparently was a common problem on 2011 siennas they were a few postings where others had dealt with it as well. I will check out that link there you got. What I looked up said P0057 was specifically dealing with a heater element on the sensor and would not harm anything.
I will look into it
Here's what steps I'd take: Yes, P0057 can cause poor engine performance-- could lead to engine damage if not repaired. Found an outline for you of 4-causes of P0057 & why repair it. Interesting read (link, below). Meanwhile, I'd change FUEL PUMP now, as a matter of prudent preventive maintenance (Rx'd at 175,000+ miles or 15+ year old vehicle), but 170,000-mi. you're close enough if yours is factory original. You won't risk getting stranded OITMON by faulty Fuel Pump-- and if you go OEM (Amazon has Denso kits for $75 or so) even better. (I read too often about aftermarket Fuel Pump failure.) But get that P0057 squared away too: