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How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic demonstrates how to replace the G28 engine speed sensor This sensor is situated at the edge of transmission over 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 situated on the edge of transmission just above the flywheel ring The sensor transmits a signal via the grey wire to pin T5549 The ECU uses this information to regulate boost and fuel It also sends an indication to the G5 Tachometer within the instrument cluster The sensor is used as a reference to correlate with the G40 Camshaft Position Sensor The ecu must know when the crankshaft has reached TDC and also the position of the camshaft so that it can activate the spark and injectors If how do i get a replacement key for my audi fails the ECU will display an error code P00160 which indicates that the Crank Shaft and Intake Camshaft arent in sync and could indicate the chain stretching or a jump link on the upper chain of timing However the code will not appear on its own without additional information from other sensors G4 and G40 Its a bit tricky to test because there are various pins on the connector and they all have different functions The most effective method to test it is to measure the resistance between the ECU and the sensor It should read around 1000 ohms if the sensor is in full operation Check for signs of coolant or oil in the connector bay if there are issues with this part 2 Injectors Yesterday while accelerating from the highway paytoll at maximum speed i noticed a huge drop in power It was like the engine was running out of gas Or my injectors werent firing This morning i pull out the spark plugs 3 were soaked with gazoline and the 4th one was dry I put a piece of tissue over each injector hole and when i start the engine without sparks the 3 with gazoline jump right out The 4th one stays shut I checked the ground connection on ECU pins 1455 3055 and 4855 i get 0ohm I think the issue is somewhere else I also tried to reset the PID with no success The car will start when the G28 is disconnected but it runs fine with the G28 connected However the intermittent misfire problem continues to occur at higher RPM The coolant sensor G62 even when unplugged still shows a temperature of 49c I also noticed that the oil gauge in the cockpit shows 2 bar when the actual pressure is 0 Im not certain what to do but i believe that ive eliminated everything else Im afraid i may have missed something If anyone has any suggestions please let me know TIA 3 Fuel Pump The fuel pump of the g28 receives a signal from the RPM sensor The GMstyle sensor is the same as the G4 and they both work in the 80 100 200 UrS and RS2 cars so you can easily find one at a junkyard or from a parts store It is simple to test them by putting your DMM in resistance mode and measure the resistance between pins 1 with the bump on the connectors end up and 2 2nd from left on the black connectors end They should be infinite ohms 4 ECU The ECU in our 20vt turbo 3B AAN ABY ADU engines must be aware of the position and speed the crankshaft in order to make a decision about fuel injector timing etc To accomplish this it makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 If you have a problem with either of these the diagnostic scanner will display codes that could lead to the engine shutting down A failing G28 sensor could result in an inaccurate gearbox speed counter a gearbox that shifts more quickly than normal andor a misfire in gear If you have any of these problems it is likely your sensor is going bad and should be replaced Theyre inexpensive and easy to locate especially in the case of an Bosch sensor like ours Alternatively the GM version of this part is also a great option 5 Tachometer A failing engine sensor could cause a number of problems within your vehicle Its a crucial component of the transmission in your Audi since it sends information to the ECU on how fast or slow the cars engine is spinning This sensor can cause the transmission to fail and other components in the car to be affected The G5 engine speed sensor is located on the edge of the transmission above the flywheel ring gear and sends a signal directly to the ECU at pin T5549 through a grey wire The ECU utilizes this signal to regulate the flow of fuel and boost as well as timig It also sends it to the G5 Tachometer located in the instrument cluster You can test the sensor for any failure by checking the continuity between it and the tachometer between the ECU pin T5549 and the instrument cluster connection via pin T6a1 trace 79trace 79 and between pin T6a1 and the instrument cluster pin T26a12 It should show approximately 1000 ohms resistance between those two pins This is a standard component across the Audi 80 100 200 UrS and RS2 range from 1985 MC to the 1997 UrS AAN and 1995 RS2 ADU so good ones could be available in wrecking yards