Check engine light came on. OBD2 gave me 5

no year, no joy. wow no year... what a pity.....
if 1996 and newer we use OBD2 scan tools
did you use a OBD2 scan tool, if yes state the make and model .
if car is older it uses OBD1, and you place a jumper clip and get flash codes out of the CEL lamp.
some 95s are OBD2 too, but we need exact year, and sub model spec on the Corolla.
The under hood sticker tells you what it is too.
saying Corolla is like saying vanilla.
see why here.
what country, yes, do tell that.
and what engine, i cant guess. you must look

http://en.wikipedia.org/wiki/Toyota_Corolla


before working car any car (engine or trans) know what you have.
if in USA< open hood, look up ,see that EPA sticker,
it even states what engine is in the car.

see list of engine here, its huge

http://en.wikipedia.org/wiki/Toyota_engines

you can take a obd2 code scanner to have a check, it will tell you what problem cause the lights on.
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TOYOTA intelligent tester 2

it means your car has the obd2 trouble code, you need a scan tool to diagnose out the code...this elm327 1.4 can diagnose your car. Or you can take your car to auto zone or car dealer to check it.

When the Check Engine light is turned on the computer control unit (PCM for Powertrain control module) ) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores and many others do this fault code testing for free.

When the Check Engine light is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

According to my 2002 Toyota Tundra manual (and it may be different for your car) P0125 is as follows:
Insufficient Coolant Temperature
for Closed Loop Fuel Control

This would seem unrelated to your original problem.

The check engine light also called the malfunction indicator comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

There are a thousand reasons for that light to be on, have the trouble codes read or buy a OBD2 CODE READER and get the codes, then we can be of some help. (maybe)

You have an emissions problem. You need to have the ECU scanned with an OBD2 scan tool. This tool will retrieve the code that has been set by the ECU. With the fault code you can get an idea of where to look. It takes a skilled technician to interpret these codes. The code will tell you what component is being effected but not necessarily what component is bad.

check the brake disks. surface should be cleaned. also check the brake pads.