Question about 2007 Toyota Sienna
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Posted on Jan 02, 2017
SOURCE: "Hello Guys, a few days
Well, there are a couple things going on here.
The code P0500 is a problem with your Vehicle Speed Sensor "A"
This can be caused by a couple things, however there is a software update available for your vehicle and if your computer has not been programmed with the latest update, I would not waste any time or effort on this code until it has.
Technical Service Bulletin # T-SB-0341-09 Rev 1
The other codes (P2238 and P2241) are for your Air-Fuel Ratio Sensors. P2238 is for the upstream Bank 1 sensor and P2241 is for the upstream Bank 2 sensor.
NOTE: The code description on your generic OBD scanner may say "OXYGEN SENSOR" or "O2S". but it is very important to understand that these are "AIR-FUEL RATIO" sensors - they do not work the same as a typical oxygen sensor, although the computer uses the data from these sensors for the same purposes.
These codes are pretty vague. They can be caused by either "open" or "shorted" AF+ or AF- circuits, or they can be caused by either "open" or "shorted" AF Sensor Heater circuits. Most of the time, these codes are caused by failed AF sensors. HOWEVER, since you have codes for BOTH sensors at the same time, it would be VERY WISE to verify the circuits for these sensors before replacing them - you may find just ONE shorted or open wire causing BOTH of these codes.
I personally have had really bad experiences with trying to replace these sensors with aftermarket sensors. I highly recommend that if you are going to replace them, get the parts from the dealer. They are also EXTREMELY expensive in comparison to regular oxygen sensors, so that is another reason for proper diagnosis before replacing them.
Posted on May 01, 2011
Testimonial: "Great, thank you for your response to my post. But i now have more questions: Now I know i need to upgrade my vehicle's software "
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