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How to Replace an Audi G28 Engine Speed SensorIn this video, Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. The sensor is located near the edges of the transmission above the flywheel ring gear. It sends a message to the ECU through an uncolored wire T55/49, then to the tachometer located on the instrument cluster.1. Engine Speed SensorThe grey wire is situated at the edges of the transmission, directly above the flywheel ring. The sensor transmits signals through the grey wire to pin T55/49. The ECU then utilizes this information to regulate the flow of fuel, timig and boost. It also sends an indication to the G5 tachometer in the instrument cluster.The sensor serves as a reference point to connect with the G40 Camshaft Position Sensor. The ecu must be aware when the crankshaft is TDC and where the camshaft is so it can activate spark and injectors in the right way.If this sensor fails, the ECU will show a P00160 code which means the Crank Shaft and Intake Camshaft are out of sync and could indicate the chain stretching or a jump link on the upper timing chain. However, the error code won’t be displayed on its own without additional information from other sensors (G4 and G40).Testing is a bit challenging since there are two connector pins, and they serve different purposes but the most effective way to test it is to measure resistance between the sensor and the ECU. It should read approximately 1000 ohms if the sensor is at full operation. Look for signs of coolant or oil in the connector bay if there are issues with this part.2. InjectorsYesterday accelerating full speed from highway paytoll i had massive power loss as if the engine was running out of gas or the injectors are not firing any more. from this source pull out the spark plugs. Three were drenched with gazoline the 4th one was dry. When I start the engine, there are no sparks, I put a piece of tissue on the top of each hole in the injector, the 3 drenched with gazoline leap out, however the 4th one stays shut. I checked 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 disconnected, but it runs fine with the G28 connected. However the intermittent misfire issue continues to occur at higher RPM. The temperature sensor for coolant (G62) shows the wrong temperature of -49c even when i unplug it. I also noticed that the oil gauge in the cockpit shows 2 bar but the actual pressure is zero.I don’t know what to do. I think I’ve eliminated everything else. I’m afraid i may have missed something. If anyone has suggestions, please share them! TIA!3. Fuel PumpThe fuel pump in the g28 is activated by a signal sent from the RPM sensor. The GM-style sensor is the same as the G4 and they both work in the 80, 100, 200, UrS and RS2 cars which is why you can easily locate one at a wrecking yard or at a parts store. Test them out – put your DMM in resistance mode and measure the resistance between pins 1 (with the bump on the connector’s end up) and 2 (2nd from left on the black end of the connector). They must be infinite Ohms.4. ECUThe ECU in our 20vt turbo (3B AAN ABY) engines requires to know the speed and position of the crankshaft in order to make a decision 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 either of these go bad you will get codes on the diagnostic scanner that could cause engine shut down.Some of the symptoms of a failed G28 sensor are an inaccurate rev counter in the gearbox the gears are shifting faster than normal, and/or a misfire when you’re in gear. If you are experiencing any of these problems, it is likely that your sensor is failing and requires replacement. The good thing is that they are very cheap and easily accessible particularly when you’re looking at a Bosch unit which is what we have. Alternately, the GM version of this component is also a great option.5. TachometerA failing engine speed sensor could be the reason behind a slew of problems in your vehicle. It’s an essential component of your Audi’s transmission, since it relays information to the ECU about how fast or slow the car’s crankshaft is rotating. If this sensor fails, it will disrupt the performance of the transmission and the other car’s components.The G5 engine sensor is located near the edge of transmission, above the flywheel ring. It transmits signals via a gray wire to the ECU pin T55/49. The ECU then processes this signal to control the flow of fuel, timig and boost as well as transmitting it to the G5 tachometer inside the instrument cluster. You can check the sensor for failure by examining the continuity between it and the tachometer. You can also check continuity between ECU pin T55/49 and the instrument cluster connection on pin T6a/1 (trace [79]) and between pin T6a/1 and the instrument cluster pin T26a/12. There should be a resistance of approximately 1000 ohms between these two points. This part is common across the Audi 80-100-200-RS2 series, starting beginning with the 1985 MC and up to the 1997 UrS AN and the 1995 RS2 Du, so you might find good ones in wrecking yards.