Mazda 6 Service Manual: No.8 does not shift to fourth gear (4gr)

No.7 no shifting

No.9 abnormal shifting

Other materials:

Mazda 6 Service Manual: Noise filter inspection
Brake Light Noise Filter 1. Inspect for resistance and continuity between the noise filter terminals using an ohmmeter. If not as specified, replace the noise filter. Rear Window Defroster Noise Filter Inspect for resistance and continuity between the noise filter terminals using an ...

Mazda 6 Service Manual: Automatic Transaxle Controls
Various Lockouts: Indicates that you must depress the brake pedal and hold in the lock-release button to shift (The ignition must be switched ON). Indicates the shift lever can be shifted freely into any position. Indicates that you must hold in the lock-release button to shift. N ...