02 sensor heater

[Johncardaci]

My mechanic noticed that the heater sensor to the 02 sensor stays on when the engine is off. The relay checks good, he thinks its the computer. Anyone have a similar problem? I am hoping its not a computer module, they cost $2000.00 plus.

Thanks,
John

[rodbolt17]

what is the engine model number?

[Johncardaci]

Its an sx150txry serial number 6g4x 053111