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Don't get a pos Isuzu Rodeo
This is such a broad question! What is it doing to make you ask "how to fix?"
Replace Replace
Take it to a service shop.
Replace the fuel cap.
i had a quote of $3900 for my 2002 rodeo 2.2L
you drop the fuel tank and replace the sending unit
they all lose oil dont fix it cause you cant it will always leak
I've read around $800-$1k if you take it to a shop..
Knock sensor needs to be replace
First find where the 99 Rodeo is leaking fuel from. Check for loose or cracked fuel lines. The leak needs to be found before driving the vehicle, as the leak could cause a fire.
it is low coolant temperature, could be the thermostat could be the sensor for coolant temperature.