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How to Replace an Audi G28 Engine Speed Sensor In this video, Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. audi car key is located on the edge of the transmission above the flywheel ring gear. It transmits a signal to the ECU through the grey wire T55/49 and then to the tachometer on the instrument cluster. 1. Engine Speed Sensor The sensor is located at the edge of the transmission above the flywheel ring gear, the G28 Engine Speed Sensor sends signals to ECU pin T55/49 through the grey wire. The ECU utilizes this information to control fuel and boost. It also sends an indicator to the G5 Tachometer within the instrument cluster. The sensor serves as a reference to correlate with the G40 Camshaft Position Sensor. The ecu needs to know when the crankshaft has reached TDC, and the position of the camshaft, in order to activate the spark and injectors. If this sensor fails to function, the ECU will display a P00160 error message. This indicates that the Crank Shaft is out of alignment with the Intake Camshaft. It could also indicate the possibility of a chain stretch or jumpy chain link in the upper chain. The code won't show without the additional information supplied by other sensors (G4 or G40). It can be a bit difficult to test because there are various pins on the connector, and each one has different functions. The best way to do it is to measure the resistance between the ECU and the sensor. It should read about 1000 ohms when the sensor is operating at its maximum. If you're having issues with this component, look for evidence of oil or coolant in the connector bay. 2. Injectors Yesterday, when i was accelerating to the fullest speed from highway paytoll, i experienced massive power loss like the engine is running out of gas or the injectors aren't firing at all. Today, i pulled 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 with no sparks, the 3 with gazoline jump out. The 4th one stays shut. I checked the ground connection on ECU pins 14/55,30/55 and 48/55 i get zero Ohm. I think the issue is elsewhere. I also tried to reset the PID but with no luck. The car will start when the G28 is disconnected, but it works fine when the G28 plugged in. However the intermittent misfire issue persists at higher RPM. The temperature sensor for coolant (G62) shows the wrong temperature value of -49c, even if I unplug it. I also noticed that the oil gauge in the cockpit shows 2 bars while the actual pressure is zero. I don't know what to do. I think I've ruled everything else out. But i am afraid I may have missed something. Let me know if you have any ideas! TIA! 3. Fuel Pump The fuel pump on the g28 is activated by a signal sent by the RPM sensor. The GM-style transmitter is similar to the G4 sender, and both operate on the 80,100,200, UrS, and RS2 vehicles. You can easily locate a spare in a wrecking shop or parts store. Test them out – put your DMM in resistance mode and take measurements between pins 1 (with the bump on the connector's side up) and 2 (2nd from left on the black connector's side). They must be infinite Ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY ADU) engines needs to be aware of the position and speed of the crankshaft to determine timing of fuel injectors, etc. It uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If either of these sensors go badly, you will see codes on the diagnostic scanner which can cause the engine to shut down. Some of the signs of a failing G28 sensor include an inaccurate rev counter in the gearbox, gears shifting quicker than normal and/or a misfire when you're in gear. It is probable that the sensor is failing and needs to be replaced if you experience any of these signs. The good news is that they are very affordable and readily available particularly in the case of an Bosch sensor, like ours. If you prefer, GM's version of this part is a good option. 5. Tachometer A malfunctioning engine speed sensor could be the reason behind many problems in your car. It's an essential component of the transmission of your Audi because it relays information to the ECU regarding how fast or slowly the car's engine is spinning. This sensor could cause the transmission to fail and other components in the car to be affected. The G5 engine sensor is located at the outskirts of transmission, above the flywheel ring. It sends a signal via a gray wire to the ECU pin T55/49. The ECU then uses and processes the signal to control the flow of fuel, timig and boost, and also sends it on to the G5 tachometer in the instrument cluster. You can test the sensor for failure by examining the continuity between it and the tachometer, between ECU pin T55/49 and the instrument cluster connection via pin T6a/1 (trace [79trace [79]) as well as between T6a/1, and the instrument cluster pin T26a/12. You should detect a resistance of approximately 1000 ohms between these points. This is a common feature across the Audi 80-100-200-RS2 series, starting from the 1985 MC all the way up to the 1997 UrS An and 1995 RS2 DU, so you might find good ones in wrecking yards.