Rover 600 P0646 Code:

OBD-II Diagnostic Powertrain (P) Trouble Code

Trouble In Rover 600 P0646 Possible Cause

The most common causes of Rover 600 P0646 code being stored are due to a defective intermediate shaft speed sensor, output speed sensor, or input speed sensor.

Common Symptoms For Rover 600 P0646

  1. This condition can be rectified by installing an in line resistor (2.5 ohms) between the signal and ground wires and leaving the exhaust gas temperature sensor disconnected
  2. If either the reference voltage or ground circuits are open, use the digital volt/ohmmeter to check for continuity (disconnect all related control modules from the circuit before checking circuit resistance or controller damage may occur) and resistance in all circuits
  3. Some applications are equipped with up to 18 separate control modules. If you choose to tackle this monumental task, begin with a careful visual inspection of all system circuitry, connectors, and fuses
  4. If the code fails to immediately return, you may have an intermittent condition

Similar Problems

Auxiliary Emission Controls
IC Circuit High Voltage
Cruise Inhibit Control Circuit

Rover 600 P0646 Troubleshooting

Having one of the signs of a bad gasket is usually not enough to prove a failure of a gasket, but multiple symptoms are most likely the result of gasket failure. It is advisable to have the vehicle driven as little as possible whenever the symptoms occur. Depending on the symptoms, either have the gasket replaced or repaired.
The cost of replacing a gasket usually varies from one mechanic to the other. Replacing a gasket is quite expensive in modern engines due to their location and the amount of labor that is required to replace them. Rover 600 P0646 OBD2 specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.

How to turn off Rover 600 P0646 check engine light ?

There are two ways to turn off the check engine light:

A repair technician can do so once repairs have been made.
The OBD II can automatically turn it off when it fails to detect the problem after several diagnostic cycles.

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