Mazda 6 Service Manual: No.12 lack/loss of power-acceleration/cruise

No.11 engine stalls/quits, engine runs rough, misses, buck/jerk, hesitation/stumble, surges

No.13 knocking/pinging-acceleration/cruise

Other materials:

Mazda 6 Service Manual: Radar Sensors (Rear) (Some models)
Your vehicle is equipped with radar sensors (rear). The following systems also use the radar sensors (rear). Blind Spot Monitoring system (BSM) Rear Cross Traffic Alert (RCTA) The radar sensors (rear) function by detecting the radio waves reflected off a vehicle approaching from the rea ...

Mazda 6 Service Manual: Exhaust system
EXHAUST SYSTEM INSPECTION Start the engine and inspect each exhaust system component for exhaust gas leakage. If leakage is found, repair or replace as necessary. EXHAUST SYSTEM REMOVAL/INSTALLATION Warning When the engine and exhaust system are hot, they can badly burn. Turn off t ...