Replace the fuel cap.
This is such a broad question! What is it doing to make you ask "how to fix?"
Replace Replace
Knock sensor needs to be replace
Take it to a service shop.
Buy a cleaning kit at Auto Zone or equal. If that does not work, you have to take it out to Radio Man. JPt
i had a quote of $3900 for my 2002 rodeo 2.2L
it is low coolant temperature, could be the thermostat could be the sensor for coolant temperature.
you drop the fuel tank and replace the sending unit
How can I fix Error code 80040154?
A code 37 on an Isuzu Rodeo means to check the transmission. This could mean that a short is occurring between the Transmission Control Module and the Electronic Computer Unit. Check all wires going from the transmission to the computer. If no short is found, a tube might be placed over the wires to prevent them from accidentally coding for no reason other than magnetic interference.
I've read around $800-$1k if you take it to a shop..