repair Niva Chevrolet

Disassembling the gearbox shafts is necessary to replace the shaft parts.
Removing the gearbox is discussed in the article - "How to replace the gearbox of the Niva Chevrolet"
Disassembling the gearbox is discussed in the article - "Repairing the gearbox of the VAZ-2123 car"

Diagnostic code maps P0136 to P0351 with the ME17.9.71 Niva Chevrolet controller
Code P0136 Oxygen sensor after the neutralizer is faulty

Prepare the car and disconnect the negative terminal of the battery
The airbag control unit circuit has an emergency power reserve