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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows you how to replace the G28 Engine Speed Sensor. This sensor is located at the top of the transmission above the flywheel ring gear. It sends a signal to the ECU via the grey wire (T55/49) which is then sent 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 transmits a signal via the grey wire to pin T55/49. The ECU uses this information to control the amount of fuel and boost. It also sends a signal 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 the location of the camshaft so it can activate spark and injectors according to the situation. If this sensor fails, the ECU will display a P00160 error code. This means that the Crank Shaft is out of 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. However, the error code won't appear on its own, without additional information from other sensors (G4 and G40). Testing can be a bit difficult as there are two different connector pins and they perform different functions but the most effective method to test it is to measure the resistance between the sensor and the ECU. When the sensor is operational, it should be reading about 1000 ohms. Examine for signs of coolant, or oil in the connector bay if you are experiencing issues with this component. 2. Injectors Yesterday, when accelerating from highway paytoll at full speed I noticed a massive drop in power. It was as if the engine had run out of gas. Or, my injectors were not firing. I took out the spark plugs this morning and found that 3 were drenched in gasoline and the 4th was dry. When i crank the engine with no sparks, I put a piece of tissue on the top of each of the injector holes and the 3 drenched with gazoline leap out, however the 4th stay shut. I tested the ground connection of ECU pins 14,30 and 48/55. I found 0ohm. So i assume the problem is somewhere else. I also tried to reset the PID with no success. The car will start when the G28 is unplugged, and it is running fine with the G28 plugged in. However, the intermittent misfire problem still occurs at higher RPM. The coolant sensor (G62) even when it is unplugged, shows a temperature of -49c. I also noticed that the oil gauge in the cockpit shows 2 bar when the actual pressure is 0. I'm not certain what to do, as i believe that i've eliminated everything else. I'm afraid i may have missed something. If anyone has any ideas please share them! TIA! 3. Fuel Pump The fuel pump in the g28 receives signals from the RPM sensor. The GM-style transmitter is identical to the G4 sender and works on the 80,100,200, UrS, and RS2 vehicles. You can easily find a spare in a wrecking shop or a parts store. It is simple to test them: simply put your DMM into resistance mode and test the distance between pins 1 and 2 (with the bump at the connector end facing up). They must be infinite Ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY ADU) engines must know the position and speed the crankshaft to make decisions regarding fuel injector timing, etc. It makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If either of these sensors go wrong, you will receive codes on the diagnostic scanner that can cause the engine to shut down. A damaged G28 sensor can cause an inaccurate speed counter for the gearbox and a gearbox which shifts more quickly than normal, or a misfire in gear. It is likely that the sensor is failing and needs to be replaced if you notice any of these signs. They're cheap and easy to find particularly when they're an Bosch sensor like ours. Alternately, the GM version of this unit is also a great option. 5. audi key fob replacement damaged engine sensor could cause a number of problems in your vehicle. It's a vital component of the Audi's transmission as it sends information to the ECU about how the car's crankshaft is turning. This sensor could cause the transmission to malfunction and other car components to be affected. The G5 engine speed sensor is located on the outside of the transmission, above the flywheel ring gear and sends a signal directly to the ECU at pin T55/49, via an uncolored wire. The ECU uses this signal to control the flow of fuel and boost and also timig. It also transmits it to the G5 Tachometer inside the instrument cluster. You can test the sensor for any failure by checking the continuity between it and the tachometer, between the ECU pin T55/49 and the instrument cluster connection via pin T6a/1 (trace [79trace [79]) and between T6a/1 and the instrument cluster pin T26a/12. There should be a resistance of approximately 1000 ohms between these points. This is the same across the Audi 80-100-200-RS2 series, starting from the 1985 MC up to the 1997 UrS AN and the 1995 RS2 Du, so you might find some good ones in wrecking yards.