What are the Volkswagen Group 91 and 93 data streams?

2 Answers
DelJesse
07/29/25 9:21pm
Volkswagen Group 91 and 93 data streams are preset values when the vehicle leaves the factory. High or low data values indicate abnormal data streams. Abnormalities in Group 91 and 93 data streams occur because the EA888 engine experiences abnormal vibrations during startup. Continuing to start the car under these conditions can cause the timing chain to skip teeth, leading to valve collision with the cylinder. It is recommended that owners take their vehicles to a 4S shop for inspection and repair. Below is a detailed introduction about automobile engines: Overview: Depending on the power source, automobile engines can be divided into diesel engines, gasoline engines, electric vehicle motors, and hybrid power, among others. Others: Common gasoline and diesel engines belong to reciprocating piston internal combustion engines, which can convert the chemical energy of fuel into the mechanical energy of piston motion and output power externally.
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StChristian
08/15/25 8:00pm
The 91 and 93 data groups of Volkswagen vehicles are quite common in OBD diagnostic systems. Group 91 is a dedicated parameter group for the engine ECU, mainly involving real-time data such as ignition timing, fuel injection quantity, and torque values, used to adjust engine performance and fuel efficiency. For example, ignition angle deviation may indicate sensor issues, requiring inspection and maintenance. Group 93, on the other hand, is the data group for the transmission TCM, including current gear position, slip rate, and oil temperature indicators, monitoring gear shift smoothness. Excessive slip, for instance, may indicate clutch wear. Reading these data requires professional tools such as VCDS or compatible diagnostic scanners, connected to the OBD interface to view real-time values, which can help promptly identify transmission faults and avoid safety hazards. Neglecting these can easily lead to a surge in fuel consumption or component damage.
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