Toyota Sienna Forum - siennachat.com banner

2004 Sienna LE P037 Fault Code

Tags
code fault p037
3K views 1 reply 2 participants last post by  fibber2 
#1 ·
Just had used engine installed(new engine) and not two weeks in, getting the P0037 Fault Code = H025 HeaterConrtol Circuit Low Voltage, Bank 1, Sensor 2. This was one of the code on that was on the engine that was replaced(old engine). Replaced all sensors on New engine. Could this just be a hold over code that needs resetting or could there be a problem with the sensor? The Old engine had 220,000 miles on it and lost compression in Chamber #3.
Where do I start with this. Thanks for all your help in advance.

Michelle
 
#2 ·
Bank 1 sensor 2 is the catalyst monitor for the rear bank of cylinders. It’s located under the van around the area of your gas pedal. In fact the wiring runs from the exhaust pipe thru the firewall around the area of the gas pedal.

As it’s not on the engine itself, did you change this in the swap? It could be a bad sensor or bad wiring. I’m sure that any codes stored from the old engine were wiped when you had the battery disconnected, so it’s new.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top