
The hydraulic unit structurally consists of an electronic control unit (ECU) and a hydraulic modulator containing electromagnetic valves (EMV), a return pump and an electric motor of the return pump

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

You will need: 13 mm, 17 mm, 27 mm wrenches, and a lug wrench.
Disconnect the front propeller shaft from the front axle gearbox (see "Removing and lubricating the Niva propeller shaft").