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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows how to replace the G28 Engine Speed Sensor This sensor is situated on the outside of the transmission above the flywheel gear It transmits a signal to the ECU via a grey wire T5549 then to the tachometer in the instrument cluster 1 Engine Speed Sensor The grey wire is located on the outside of the transmission above the flywheel ring This sensor sends signals through the grey wire to pin T5549 The ECU uses this information to regulate boost and fuel It also sends an alert to the G5 Tachometer located in the instrument cluster The sensor is used as a reference for comparing with the G40 Camshaft Position Sensor The ecu needs to be aware of when the crankshaft has reached TDC and the location of the camshaft so that it can activate the spark and injectors If this sensor fails the ECU will throw an error code P00160 which indicates that the Crank Shaft and Intake Camshaft are not in sync possibly indicating chain stretch or a jumped link on the upper chain of timing However the code wont be displayed on its own without additional information from other sensors G4 and G40 It is a little tricky to test since there are different connector pins and each has its own functions The best method for doing this is to measure the resistance between the ECU and the sensor It should read around 1000 ohms when it is operating at its maximum Look for signs of coolant or oil in the connector bay if you have issues with this part 2 audi car keys when i was accelerating to the fullest speed from highway paytoll i had a big cut in power as if the engine was running out of gas or injectors are not firing at all I pulled out the spark plugs this morning 3 were soaked with gasoline and the 4th was dry I placed a tissue over each hole in the injector and when i start the engine without sparks the 3 with gazoline jump out The fourth one remains closed I tested the ground connection on ECU pins 14553055 and 4855 I get zero ohm Im assuming that the issue is somewhere else I also tried to reset the PID with no success The car will start when the G28 is unplugged and it works fine when the G28 plugged in However the intermittent misfire issue still occurs at higher RPM The temperature sensor for coolant G62 shows the wrong temp value 49c even if I unplug it Also i noticed that the oil pressure gauge in the cockpit shows 2 bar when the actual pressure is 00 when i rev the engine Im not certain what to do as i believe that ive completely ruled out all other possibilities Im concerned that i may have missed something Let me know should you have any suggestions TIA 3 Fuel Pump The fuel pump on the g28 is activated by a signal by the RPM sensor The GMstyle transmitter functions similarly to the G4 sender and both work on the 80100200 UrS and RS2 vehicles You can easily locate the spare in a salvage shop or parts store It is easy to test them just put your DMM into resistance mode and determine the distance between pins 1 and 2 with the bump on the connectors edge facing upwards They should be infinite ohms 4 ECU The ECU in our 20vt turbo 3B AAN ABY engines must be aware of the position and speed of the crankshaft to determine timing of fuel injectors etc To do this it utilizes a Crank Position Sensor G4 and an Engine Speed Sensor G28 If you have a problem with either of these sensors the diagnostic scanner will show codes that could lead to an engine shutdown A damaged G28 sensor can cause an inaccurate gearbox speed counter and a gearbox which shifts more quickly than normal andor an unfire when in gear It is probable that the sensor is failing and needs to be replaced if you encounter any of these symptoms Theyre inexpensive and easy to locate especially if theyre an Bosch unit like ours You can also choose the GM version of this unit is also a good choice 5 Tachometer A malfunctioning engine sensor can cause a variety of issues within your vehicle Its an essential component of the transmission of your Audi since it sends information to the ECU about how fast or slow the engine of the car is turning This sensor could cause the transmission to malfunction and other components in the car to be affected The G5 engine speed sensor is situated on the outside of the transmission just above the flywheel ring gear It sends a signal directly to the ECU at pin T5549 via an uncolored wire The ECU then uses and processes this signal to control fuel timig and boost and also sends it on to the G5 tachometer inside the instrument cluster You can test for sensor failure by examining the continuity from the sensor to the tachometer Additionally you can examine the continuity between pins T5549 of the ECU and pin T6a1 of the instrument cluster trace 79 and between pin T6a1 and pin T26a12 You should observe around 1000 ohms of resistance between these two points This part is common across the Audi 80100200RS2 model ranging from the 1985 MC all the way up to the 1997 UrS An and 1995 RS2 DU So you may find good ones in wrecking yards