you need to run the car and see if the fan comes on if it does change the thermostat and gasket if it does not you need a fan sensor
SOURCE: How do you reset the check engine light on an Acura TL 1999
i dont know how else to do it other than with a diagnostic tester. i think that may be the only way.
SOURCE: 98 Acura CL oil in coolant/radiator
Check the oil, is the oil milky on the dipstick?
Check the Transmission Fliud level, Low?
If it is engine oil it could be a head gasket, if it is transmission oil then the cooling lines in the lower tank of the radiator may be leaking.
SOURCE: Code P0505 on 1999 Acura TL
this code make reference to low idle engine,maybe the throttle body is dirty , air filter clogged, vacumm leak , pcv valve clogged, check for thoses
Push the select and reset switch at the same time, turn the ignition switch ON (II), and hold them more then 10 seconds.
The above sentence came straight from the 2001 Acura TL service manual.
Joe
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