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How to Replace a cool way to improve shows you how to replace the G28 Engine Speed Sensor The sensor is located on the edge of the transmission above the flywheel ring gear It transmits a signal the ECU via the grey wire T5549 which is then sent to the tachometer in the instrument cluster 1 Engine Speed Sensor The grey wire is situated on the outside of the transmission above the flywheel ring This sensor sends signals through the grey wire to pin T5549 The ECU then uses this information to control the boost fuel and timig It also sends an indication to the G5 Tachometer located in the instrument cluster The sensor is used to correlate with the G40 Camshaft position Sensor The ecu needs to know when the crankshaft is TDC and where the camshaft is located so that it can trigger spark and injectors in the right way If this sensor fails to function the ECU will display a P00160 error message This means that the Crank Shaft is not in alignment with the Intake Camshaft It could also be a sign of the possibility of a chain stretch or jump in the chain link of the upper chain However the error code wont appear on its own without additional information from other sensors G4 and G40 It can be a bit difficult to test since there are different connector pins and each one has different functions The best way to do it is to measure the resistance between the ECU and the sensor When the sensor is fully operational it should read around 1000 ohms If youre experiencing issues with this part check for signs of oil or coolant in the connector bay 2 Injectors Yesterday when i was accelerating to the fullest speed from highway paytoll I experienced an abrupt drop in power like the engine is out of gas or the injectors arent firing anymore I took out the spark plugs this morning three were drenched in gasoline and the fourth was dry When i crank the engine without sparks I put a piece of tissue on top of each injector hole and the 3 that were drenched in gazoline pop out but the 4th stays shut I tried to test the ground connections of ECU pins 1430 and 4855 I got zero ohm Im assuming the issue is elsewhere I also tried to reset the PID but with no luck The car can start when the G28 is not plugged in and it runs perfectly when it is connected however it has the intermittent misfire issue at higher RPM The coolant temperature sensor G62 shows the wrong temperature of that is 49c even after unplugging it Also i noticed that the oil pressure gauge in the cockpit is showing 2 bar whereas the actual pressure is 00 when I crank up the engine Im not sure what to do as i feel i have pretty much ruled out everything else But i am afraid I may have missed something Let me know If you have any suggestions TIA 3 Fuel Pump The fuel pump of the g28 receives a signal from the RPM sensor The GMstyle transmitter functions similarly to the G4 sender and both operate on the 80100200 UrS and RS2 vehicles It is easy to find the spare in a salvage shop or parts store Test them out by putting your DMM in resistance mode and measure the resistance between pins 1 with the bump on the connectors side up and 2 2nd from the left on the black end of the connector They should be infinite Ohms 4 ECU Our 20vt turbo 3B AAN ABY and ADU engines are equipped with an ECU that has to know the position and speed of the crankshaft to make decisions about fuel injector timing etc In order to do this it makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 If you are experiencing issues with either of these sensors the diagnostic scanner will display the codes that could trigger an engine shut down A failing G28 sensor can cause an inaccurate speed counter for your gearbox a gearbox that shifts faster than normal andor a misfire while in gear It is likely that the sensor is failing and requires to be replaced if you experience any of these symptoms The good news is they are very affordable and easily accessible particularly in the case of the Bosch model which is what ours are You can also choose the GM version of this part is also a good option 5 Tachometer A damaged engine sensor could cause a number of problems within your vehicle Its a vital component of your Audis transmission since it relays information to the ECU about how the cars crankshaft is spinning This sensor can cause the transmission to fail and other car components 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 via an uncolored wire audi replacement car keys uses this signal to regulate the flow of fuel and boost as well as timig more information sends it to the G5 Tachometer located in the instrument cluster You can test the sensor for failure by checking continuity between it and the tachometer between ECU pin T5549 and the instrument cluster connection to pin T6a1 trace 79 and between pin T6a1 and the instrument cluster pin T26a12 You should see the resistance to be around 1000 ohms between these two points This is the same across the Audi 80100200RS2 range from the 1985 MC all the way up to the 1997 UrS An and 1995 RS2 Du So you may find some good ones in wrecking yards