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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 situated on the edge of the transmission above the flywheel ring gear. It transmits a signal the ECU via an uncolored wire (T55/49) and then to the tachometer within the instrument cluster. 1. Engine Speed Sensor The grey wire is situated on the edge of transmission, above the flywheel ring. This sensor sends signals through the grey wire to pin T55/49. The ECU then uses this information to control fuel, timig and boost. It also sends signals to the G5 Tachometer located in the instrument cluster. The sensor is used as a reference to correlate with the G40 Camshaft Position Sensor. The ecu needs to know when the crankshaft is TDC and the location of the camshaft so it can activate spark and injectors in the right way. If this sensor fails when it fails, the ECU will display a P00160 error code. 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 jumped chain link in the upper chain. However, the error code won't appear on its own without additional information from other sensors (G4 and G40). Testing is a bit challenging because there are two pins for the connector and they perform different functions but the most effective method of testing it is to measure the resistance between the sensor and the ECU. When the sensor is fully operational, it should be reading about 1000 ohms. Look for evidence of coolant or oil in the connector bay if there are issues with this part. 2. Injectors Yesterday accelerating full speed from highway paytoll i had an abrupt drop in power like the engine is out of gas or the injectors aren't firing at all. Today, i pulled out the spark plugs, three were drenched in gazoline, the 4th one was dry. When i crank the engine without sparks, I put a piece of tissue on top of each injector hole and the 3 drenched with gazoline jump out but the 4th one stays shut. I tried to test the ground connections of ECU pins 14,30, and 48/55. I found 0ohm. I assume that the problem is elsewhere. I also tried to reset PID without success. The car will start when the G28 is not plugged in and runs fine when it is connected however it has intermittent misfire issues at higher RPM. The coolant sensor (G62), even if it is not plugged in, shows temperatures of -49c. I also noticed that the oil gauge in the cockpit shows 2 bars when the actual pressure is zero. I don't know what to do. I believe that I've all other possibilities out. I'm concerned that i may have missed something. If anyone has any ideas please let me know! TIA! 3. Fuel Pump The fuel pump of the g28 gets a signal from the RPM sensor. The GM-style sensor is the same as the G4 and both function in the 80, 100 200, UrS and RS2 cars so you can easily find one at a wrecking yard or at a parts store. It is easy to test them – simply switch your DMM into resistance mode and test 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 of our 20vt turbo (3B AAN ABY) engines needs to be aware of the position and speed the crankshaft to determine fuel injector timing, etc. To accomplish this, it makes use of a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If either of these go wrong, you will receive codes on the diagnostic scanner that can cause the engine to shut down. A damaged G28 sensor could result in an inaccurate gearbox speed counter, a gearbox that shifts faster than normal, and/or a misfire in gear. If you have any of these issues it is likely that your sensor is failing and requires replacement. The good thing is that they are very affordable and easily accessible particularly when you're looking at an Bosch sensor, like ours. You can also choose the GM version of this part is also a good option. 5. replacement audi car key can cause a myriad of issues in your car. It is a crucial part of your Audi's transmission, because it communicates to the ECU about how fast or slow the car's crankshaft is rotating. If the sensor fails, it could cause problems for the transmission as well as the rest of the car's components. The G5 engine speed sensor is located at the outside of the transmission, above the flywheel ring gear and sends a signal to the ECU at pin T55/49 through an uncolored wire. The ECU utilizes this signal to regulate fuel and boost, and also to timigrate. It also sends it to the G5 Tachometer in instrument cluster. You can determine if the sensor is in failure by examining the continuity of the sensor to the tachometer. You can also verify continuity between pin T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79trace [79]), and between pin T6a/1 as well as pin T26a/12. You should see around 1000 ohms of resistance between those points. This is the same across the Audi 80-100-200-RS2 range, from the 1985 MC up to the 1997 UrS AN and the 1995 RS2 DU So, you may find some good ones in wrecking yards.