[Rangerdb]

Lately the MIL light has been coming on in the dashboard periodicaly on my Uforce 500. It doesn't flash, just a steady light. It usually happens when idling for more than a few minutes or driving slow (under 10 kms). Once I speed up for a bit, the light will go out. Any ideas on what causes it?

[NMKawierider]

There's a procedure that makes it flash a code that can be looked up in the manual but I suspect it may say there is an error on the O2 sensor. At full operating temperature it should be putting out a certain reading within a range but at slow speeds where it cools some it may fall below that range. Just a guess...as some have said they had troubles with some O2 sensors on the 500s. Grab the manual and get the code to be for sure first.

[Rangerdb]

It seems that low coolant was causing it. Because it was only coming on when idling or going slow, I thought maybe it was a heating problem, even though the guage wasn't showing hot. I topped off the radiator and it did take a fair amount. Ran it all day today and the MIL light never came on once. I guess it doubles as a low coolant light also. Now to figure out where the coolant went.

Thanks for the reply NMKawierider.

[NMKawierider]

Good, well, there are several sensors that feed the ECM and several are temperature. I guess if there is something amiss then it gives an error. Good to know. Check your water pump...most are leaning past the mechanical seal and out the weep hole/tube.

[Rangerdb]

I knew the 800's were having the water pump seal problem, are the 500's also having it?

[NMKawierider]

I knew the 800's were having the water pump seal problem, are the 500's also having it?

Some. I think it's a seal problem and they use the same seal on several engines.