2003 Toyota Sienna Questions

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with 97,000 miles does Sienna 2003 fuel injectors need cleaning? When does the spark plugs need to be replaced (originals still in) when is a tuneup needed? Van runs well except once it stalls when starting but ran fine after revving to 6k for a couple of seconds
Pls help me my car have been overheating since 4 days ago. Av flushed d hose,radiator not leaking but still the same after driving like an hour or am in traffic.
Please help me out as this is becoming unbearable for me. No noise or leak from the car
my toyota have 3.0 6cylinder and would like to know where the etc sensor is located
Check engine is on with TRAC OFF and VSC. I checked with OBD-II. It showed P0136 refer to Bank 1 Sensor 2. But at the same time I see voltage only on B1S2. Other o2 sensors without any voltage. What can you suggest? I replaced B2S1 front upstream, but no voltage through OBD-II.
I had a Prius it was difficult to repair and expensive. I had to take it to the dealership just to have the oil changed due to it being a hybrid.
Now I am looking at a buying a Sienna. Are they difficult to repair? Could I do basic repairs?
After non-use for a while it will cool again. New condenser and Freon.
is there a relay or fuse somewhere?
It passed the fuel cap test.
It is a light colored oil
Sometimes when I put my key in I have to jiggle it around for minutes and then suddenly it allows me to turn the key and start the car.
_ diagnostic code PO758
_ the transmision shifting is not smooth.
I bought Toyota Sienna 2003 XLE which was transferred from 1st dealer to 3rd dealer then the 3rd dealer claimed the current odometer is reading 100,420 mileage which actually display on the dashboard unfortunately I was searching for something else 2 weeks later after the car was bought. I found 2 reassignment dealer titles stated that odometer are 184,787 and 185,126 mileage with the same VIN number written on the documents respectively from the 1st and 2nd dealers. Can someone tell me if odometer was rollback or what?
I need inspection cert and after visiting auto center they mention Obd 2 analyzer did not communicate during diagnostic test. i recently got check engine fixed for o2 sensors.
We only received one key when we got the van from a dealer. I guess we should have pressed them for a spare. They wanted over $100 for a new key.

I am quite disgruntled about the entire thing. How does making a smarter key help me with security?
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