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How to Replace an Audi G28 Engine Speed SensorCharles the Humble Technician shows how to replace the G28 Engine Speed Sensor. This sensor is located near the edges of the transmission above the flywheel ring gear. It sends a message to the ECU through the grey wire T55/49 and then to the tachometer located on the instrument cluster.1. audi keys replacement 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 fuel and boost. It also sends signals to the G5 tachometer in the instrument cluster.The sensor is used as a reference to correlate with the G40 Camshaft Position Sensor. The ecu has to be aware of when the crankshaft has reached TDC, and the location of the camshaft in order to activate the spark and injectors.If this sensor fails, the ECU will throw a P00160 code which means the Crank Shaft and Intake Camshaft aren’t in sync and possibly indicating chain stretch or a jumped link on the upper timing chain. However the code will not be displayed on its own without additional information from other sensors (G4 and G40).Testing is a bit tricky because there are two connector pins, and they perform different functions but the best way to test it is by measuring resistance between the sensor and the ECU. It should read about 1000 ohms when the sensor is at full operation. Check for evidence of coolant or oil in the connector bay if you are experiencing issues with this component.2. InjectorsYesterday accelerating full speed from highway paytoll, I experienced massive power loss like the engine is out of gas or injectors are not firing at all. I pulled out the spark plugs this morning, 3 were soaked in gasoline, and the 4th was dry. When I start the engine, there are no sparks i put tissue on the top of each hole in the injector, the 3 drenched with gazoline pop out, but the 4th stays shut. I tested the ground connection of ECU pins 14,30, and 48/55. I found zero ohm. So i assume the problem is in another place.I also tried to reset the PID but without success. The car will start when the G28 is unplugged, and it runs fine with the G28 connected. However, the intermittent misfire problem still occurs at higher RPM. The coolant temperature sensor (G62) shows the wrong temperature value of -49c even when i unplug it. I also noticed that the gauge for oil pressure in the cockpit shows 2 bar when the actual pressure is 0.0 if i crank up the engine.I’m not sure what to do. I think I’ve eliminated everything else. I’m worried that i might have missed something. Let me know should you have any suggestions! TIA!3. Fuel PumpThe fuel pump on the g28 is activated by a signal from the RPM sensor. The GM-style transmitter is identical to the G4 and both are used in the 80 100 200, UrS and RS2 cars which is why you can easily locate one at a junkyard or from a parts store. Testing them is easy by putting your DMM in resistance mode and measure between pins 1 (with the bump on the connector end up) and 2 (2nd from left on the black connector’s end). They should be infinite Ohms.4. ECUThe ECU in our 20vt turbo (3B AAN ABY) engines needs to know both the position and speed of the crankshaft in order to make a decision about fuel injector timing, 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 could cause engine shut down.Some of the symptoms of a failed G28 sensor are an inaccurate gearbox rev counter, gears shifting quicker than normal and/or misfiring when you’re in gear. If you have any of these problems, it is most likely that your sensor is failing and requires replacement. The good thing is that they are quite affordable and readily available, especially if you’re looking at the Bosch model, which is what we have. Alternately, the GM version of this unit is also a good option.5. TachometerA failing engine speed sensor could be a cause for a slew of issues with 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 spinning. If this sensor fails, it can disrupt the performance of the transmission, as well as the rest of the car’s components.The G5 engine sensor is located at the outskirts of the transmission, over the flywheel ring. It sends signals via an uncolored wire to the ECU pin T55/49. The ECU uses this signal to regulate the flow of fuel and boost as well as timig. It also sends it to the G5 Tachometer in instrument cluster. You can determine if the sensor is in failure by examining the continuity from the sensor to the tachometer. You can also examine the continuity between pins T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79]) and between pin T6a/1 as well as pin T26a/12. You should see approximately 1000 ohms resistance between those two pins. This part is common across the Audi 80-100-200-RS2 model, ranging from the 1985 MC all the way up to the 1997 UrS AN and the 1995 RS2 Du So, you may find them in wrecking yards.