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How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. The sensor is located at the top of the transmission, above the flywheel ring gear. It sends a message to the ECU via a grey wire T55/49, then to the tachometer in the instrument cluster. 1. Engine Speed Sensor The sensor is located at the edge of the transmission just above the flywheel ring gear the G28 Engine Speed Sensor sends a signal to ECU pin T55/49 through the grey wire. The ECU utilizes this information to control the amount of fuel and boost. It also sends a signal to the G5 tachometer in the instrument cluster. The sensor is used to connect the G40 Camshaft position Sensor. The ecu has to be aware of when the crankshaft has reached TDC and also the position of the camshaft, to trigger the spark and injectors. If this sensor fails to function, the ECU will display a P00160 error message. This means that the Crank Shaft is not in sync with the Intake Camshaft. It could also indicate an issue with the chain or a jumpy chain link in the upper timing chain. However, the error code won't appear on its own, without additional information from other sensors (G4 and G40). It can be a bit difficult to test as there are several pins on the connector, and each one has different functions. The best way to do it is by measuring the resistance between the ECU and the sensor. When the sensor is fully operational, it should be reading approximately 1000 ohms. If you are having problems with this sensor, look for evidence of oil or coolant in the connector bay. 2. Injectors Yesterday accelerating full speed from highway paytoll i had massive power loss like the engine is running out of gas or injectors are not firing any more. I pulled out the spark plugs this morning and found that 3 were soaked in gasoline, and the fourth was unclean. I put tissue over each injector hole and when I turn the engine on without sparks, the 3 that have gazoline pop right out. The 4th one remains shut. I checked the ground connection of ECU pins 14,30, and 48/55. I found zero ohm. Therefore, i think the issue is in another place. I also tried to reset PID but without success. The car can start when the G28 is disconnected and it runs perfectly when it is connected however it has the intermittent misfire issue at higher RPM. The temperature sensor for the coolant (G62) shows the wrong temp value -49c, even if I unplug it. I also noticed that the oil gauge in the cockpit shows 2 bar when the actual pressure is 0. I'm not sure what to do. I think I've all other possibilities out. I'm afraid i may have missed something. If anyone has suggestions, please let me know! TIA! 3. Fuel Pump The fuel pump in the g28 receives signals from the RPM sensor. The GM-style transmitter is identical to the G4 sender and works on the 80,100,200, UrS, and RS2 vehicles. It is easy to find a spare in a wrecking shop or parts store. It is easy to test them: simply put your DMM into resistance mode and measure the distance between pins 1 and 2 (with the bump at the connector end facing upwards). They must be infinite Ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY ADU) engines needs to be aware of the position and speed of the crankshaft to determine timing of the fuel injector, etc. It uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this. If either of these sensors go bad you will get codes on the diagnostic scanner that can cause the engine to shut down. The signs of a failing G28 sensor include an inaccurate rev counter for the gearbox and gears that shift faster than normal, and/or a misfire when in gear. It is probable that the sensor is failing and requires to be replaced if you experience any of these signs. lost audi keys is they are very affordable and readily available, especially if you're looking at the Bosch unit which is what ours are. Alternatively, GM's version of this part is an excellent choice. 5. Tachometer A malfunctioning engine speed sensor could be the reason behind many issues in your car. It's an essential component of the transmission in your Audi because it relays information to the ECU about how fast or slowly the engine of the car is spinning. When this sensor fails, it will disrupt the performance of the transmission and the other car's components. The G5 engine speed sensor is located on the edge of the transmission, above the flywheel ring gear. It sends a signal to the ECU at pin T55/49 through an uncolored wire. replace audi key uses this signal to regulate fuel and boost, as well as timig. It also transmits it to the G5 Tachometer in instrument cluster. You can check for sensor failure by examining the continuity of the sensor to the tachometer. Also, you can check continuity between pin T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79]), and between pin T6a/1 as well as pin T26a/12. You should detect a resistance of approximately 1000 ohms between these points. This is the same across the Audi 80-100-200-RS2 range, beginning with the 1985 MC and up to the 1997 UrS AN and the 1995 RS2 Du, so you might find good ones in wrecking yards.