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try going to an autozone to get a free diagnostic to see what your code is once you got it go sinautoscan.com under forum search for the code to find the probable causes
if it shifts hard from park to reverse look into you engine and transmission mounts about the noise check the front wheel bearings.
If you replace the brake light switch and you are sure you did it correctly the only other thing it could be is open in the wire meaning you have to check the electrical lines from the light switch to the rear brake lights. go to sinautoscan.com on the forum ask for a electrical diagram include all the information about your car make model engine size and al attach the electrical diagram.
You can find just about anything on ebay, if not there google it, or the dealer.
They connect to the coolant system the warm coolant makes the air hot that's how you get Heating
If the car is losing power it may cause all your light to come on you should check your charging system alternator, battery.
Disconnect the battery for 10mins this should do the trick. If you have a big problem where the OBD system detects the problem as soon as the car is started theres nothing you could do but repair your vehicle.
It is a warning light that is illuminated when there is a problem with the EMISSION SYSTEM only. Emission system being the pollution control system.
When the Check Engine Flashes Its reading out a code you count the number it flashes follow by a pause then it flashes out the second digit codes are usually 2 digits.
First check out your Charging System the Altenator maybe draining the Battery, once you get this solve, if your car is 1996 or newer you may need to drive cycle you car visit this page it has driving cycle procedures http://sinautoscan.com/forum/index.php?topic=6.0