Mazda 6 Service Manual: No.18 cooling system concerns-runs cold

No.17 cooling system concerns-overheating

No.19 exhaust smoke

Other materials:

Mazda 6 Service Manual: Operation
NOTE The engine may not start and security indicator light may illuminate or flash if the key is placed in an area where it is difficult for the system to detect the signal, such as on the dashboard or in the glove compartment. Move the key to a location within the signal range, switch ...

Mazda 6 Service Manual: Contact Authorized Mazda Dealer and Have Vehicle Inspected
If any of the following warning lights or the indicator light turns on/flashes, the system may have a malfunction. Contact an Authorized Mazda Dealer to have your vehicle inspected. ...