The video focuses on the basic Audi diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make:
Audi
Code:
P1105
Definition:
O2 Sensor Circuit (Bank 1-Sensor 2) Short to B+
Description:
Engine started, battery voltage must be at least 11.5v, all electrical components must be off, the ground between the engine and the chassis must be well connected, the exhaust system must be properly sealed between the catalytic converter and the cylinder head, and the oxygen sensor heater for oxygen sensor before the catalytic converter must be properly functioning. The ECM detected a voltage on the O2 sensor circuit that was outside the parameters to function properly. Note: For resistance testing of sensor heating, oxygen sensor should be cooled to ambient temperature. High temperatures at oxygen sensor may lead to inaccurate measurements.
Cause:
Oxygen sensor (before catalytic converter) is faulty
Oxygen sensor (behind catalytic converter) is faulty
Oxygen sensor heater (before catalytic converter) is faulty
Oxygen sensor heater (behind catalytic converter) is faulty
Circuit wiring has a short to power or ground
Engine Component Power Supply Relay is faulty
E-box fuses for oxygen sensor are faulty
Leaks present in the exhaust manifold or exhaust pipes
HO2S signal wire and ground wire crossed in connector
HO2S element is fuel contaminated or has failed
ECM has failed

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