2004 sienna lots of electric problems

1 The heater in my 2004 sienna, only 10000miles, has not been working for a while; it always blows cold air. I'm presuming th! at since both of the water hoses going into and out of the firewall get hot, the problem is not likely to be the heater core (or is it?). A/C runs fine. OBD code rider gives P0051 HO2S heater control circuit low (bank2 sensor1). Where the bank2 sensor1 are located? speedometr is not working, doesn't show any changes in speed, always at zero. 3 No power to the tailgate lock. Any suggestions how to fix it? Thanks in advance.Roman

Bring it it for warranty. It's only got 10000 onit and is less than 2 years old so it's still have factory warranty.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

did these all appear at once? did you do some sort of install or modification before these appeared? There could be a myriad of issues to cause these problems. Definitely start with your fuse box. Should be one under the dash and one under the hood. If the fuses are all good, and you haven't done any mods to these systems, then a trip to the dealer for some warranty work would be in order. I can understand wanting to avoid the dealer trip, but with the low mileage they should cover all the repairs you've described.Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.