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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 The sensor is located at the top of the transmission above the flywheel ring gear It transmits a signal the ECU via a grey wire T5549 then to the tachometer in the instrument cluster 1 Engine Speed Sensor The grey wire is situated at the edges of the transmission above the flywheel ring The sensor sends an electrical signal through the grey wire to pin T5549 The ECU uses this information to regulate the amount of fuel and boost It also sends signals to the G5 tachometer in the instrument cluster The sensor is used to connect the G40 Camshaft position Sensor The ecu must be aware when the crankshaft is TDC and the location of the camshaft so it can activate spark and injectors accordingly If this sensor fails to function the ECU will display a P00160 error message This indicates that the Crank Shaft is not in sync with the Intake Camshaft It could also be a sign of an issue with the chain or a jumpy chain link in 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 as there are different pins on the connector and each one has different functions The best method for doing this is by measuring the resistance between the ECU and the sensor When the sensor is fully operational it should read about 1000 ohms Look for signs of coolant or oil in the connector bay if you are experiencing issues with this component 2 Injectors Yesterday while accelerating from the highway paytoll at a high speed I noticed a massive reduction in power visit the following website page was like the engine had run out of gas Or my injectors werent firing I pulled out the spark plugs this morning and found that 3 were drenched in gasoline and the fourth was dry I placed a tissue over each hole in the injector and when i start the engine with no sparks the ones with gazoline jump out The fourth one remains shut I tested the ground connection of ECU pins 1430 and 4855 I got zero ohm Therefore i think the issue is in another place I also tried to reset the PID without success The car will start if the G28 is disconnected and runs fine when it is connected but it still has the intermittent misfire issue at higher RPM lost my audi car keys G62 even if it is not plugged in shows an ice temperature of 49c Also i noticed that the oil pressure gauge in the cockpit shows 2 bar while the actual pressure is 00 if i crank up the engine Im not sure what to do i feel i have pretty much ruled out everything else Im worried that i might have missed something Let me know If you have any suggestions TIA 3 Fuel Pump The fuel pump of the g28 gets a signal from the RPM sensor The GMstyle transmitter is identical to the G4 and they both work in the 80 100 200 UrS and RS2 cars which is why you can easily locate one at a salvage yard or from a parts store It is easy to test them simply switch your DMM into resistance mode and determine the distance between pins 1 and 2 with the bump at the connectors end facing up They must be infinite Ohms 4 ECU Our 20vt turbo 3B AAN ABY and ADU engines have an ECU that needs to be aware of the speed and position of the crankshaft to make decisions about fuel injector timing etc It makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this If you encounter a problem with either one of these the diagnostic scanner will show the codes that could trigger the engine shutting down A malfunctioning G28 sensor could cause an inaccurate speed counter for the gearbox or a gearbox that shifts faster than normal or an unfire when in the gear If you are experiencing any of these issues it is most likely that your sensor is going bad and requires replacement The good news is that they are very cheap and easily accessible particularly when youre looking at an Bosch model which is what ours are You can also choose the GM version of this part is also a good choice 5 Tachometer A failing engine sensor could cause a number of problems in your car Its an essential component of the Audis transmission because it communicates to the ECU about how the cars crankshaft is turning When this sensor fails it could affect the performance of the transmission as well as the other cars components The G5 engine speed sensor is located on the edge of the transmission above the flywheel ring gear It transmits a signal to the ECU at pin T5549 via a grey wire The ECU uses this signal to control fuel and boost as well as timig It also transmits it to the G5 Tachometer inside the instrument cluster You can test for sensor failure by examining the continuity from the sensor to the tachometer Also you can verify continuity between pin T5549 of the ECU and pin T6a1 of the instrument cluster trace 79trace 79 and between pin T6a1 as well as pin T26a12 There should be a resistance of approximately 1000 ohms in these areas This is a common 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 parts could be found in wrecking yards