Which hidden issue turned on the engine management light?

Question

Best Smog Check in Rancho Cucamonga

Answer 1

Primary issues which turns the check engine light on are- 

1. Clutch malfunction 

2. Gear malfunction

3. Engine overheating

Now engine overheating also caused by 

a. Low coolant level

b. Wrong inputs going to the fuel injector.

c. Excess carbon emission (if you ignore this, it will damage your catalytic converter)

Answer 2

The hidden issue that led to the engine management light turning on being Presence of high levels of smog in the air. This was due to the engine being in the smog Check area for a short amount of time.