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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. This sensor is located at the edge of transmission just above the flywheel gear. It transmits a signal to the ECU via the grey wire (T55/49) which is then sent to the tachometer within the instrument cluster.1. Engine Speed SensorThe grey wire is situated on the outside of the transmission, above the flywheel ring. The sensor transmits signals through the grey wire to pin T55/49. The ECU then uses this information to control the flow of fuel, timig and boost. It also sends an indication to the G5 tachometer in the instrument cluster.The sensor is used to link with the G40 Camshaft position Sensor. The ecu needs to know when the crankshaft is TDC and where the camshaft is located so that it can activate spark and injectors according to the situation.If this sensor fails when it fails, the ECU will display an error code P00160. audi key programming near me means that the Crank Shaft is not in line with the Intake Camshaft. It could also be a sign of a chain stretch or a jumpy chain link in the upper timing chain. The code won't appear without the additional information supplied by other sensors (G4 or G40).Testing can be a bit difficult as there are two different connector pins and they perform different functions but the most effective way to test it is to measure resistance between the sensor and the ECU. It should read approximately 1000 ohms when it is at full operation. If you're having issues with this sensor, look for signs of coolant or oil in the connector bay.2. audi lost key , when i was accelerating to the fullest speed from highway paytoll i had massive power loss like the engine is out of gas or the injectors aren't firing anymore. I took out the spark plugs this morning, three were drenched in gasoline and the fourth was unclean. I put a piece of tissue over each injector hole and when i turn the engine on without sparks, the three with gazoline jump right out. The 4th one remains closed. I checked the ground connection of ECU pins 14,30, and 48/55. I found zero ohm. So i assume the problem is somewhere else.I also tried to reset the PID without success. The car is able to start when the G28 is unplugged and runs fine when it is plugged in however it has intermittent misfire issues at higher RPM. The coolant temperature sensor (G62) shows the wrong temperature of that is -49c even after unplugging it. Also i noticed that the gauge for oil pressure in the cockpit shows 2 bar while the actual pressure is 0.0 if i crank up the engine.I'm not certain what to do, as i believe that i've eliminated everything else. I'm concerned that i may have missed something. Please let me know if you have any ideas! TIA!3. Fuel PumpThe fuel pump on the g28 is activated by a signal from 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 the spare in a salvage shop or 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 side). They must be infinite Ohms.4. ECUOur 20vt turbo (3B, AAN, ABY and ADU) engines are equipped with an ECU that must be aware of the speed and position of the crankshaft to make a decision about timing of the fuel injector, for example. To accomplish this, it makes use of a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you have a problem with either of these, the diagnostic scanner will show the codes that could trigger an engine shut down.A malfunctioning G28 sensor could result in an inaccurate speed counter for the gearbox and a gearbox which shifts more quickly than normal, and/or a misfire while in the gear. If you are experiencing any of these problems, it is most likely that your sensor is going bad and requires replacement. They're inexpensive and easy to locate, especially if they're a Bosch unit like ours. If you prefer, GM's version of this part is an option.5. TachometerA failing engine sensor could cause a myriad of issues within your vehicle. It's an essential component of the transmission of your Audi because it relays information to the ECU regarding how fast or slow the engine of the car is turning. If the sensor fails, it will affect the performance of the transmission as well as the other car's components.The G5 engine speed sensor is situated on the outside of the transmission above the flywheel ring gear and transmits a signal to the ECU at pin T55/49, via a grey wire. The ECU is then able to process this signal to control fuel, timig, and boost as well as sends it on to the G5 tachometer inside the instrument cluster. You can check the sensor for failure by checking continuity between it and the tachometer, between ECU pin T55/49 and the instrument cluster connection via pin T6a/1 (trace [79]) as well as between T6a/1, and the instrument cluster pin T26a/12. You should observe around 1000 ohms of resistance between those points. This is a common feature across the Audi 80-100-200-RS2 model, ranging beginning with the 1985 MC and up to the 1997 UrS An and 1995 RS2 DU So, you may find some good ones in wrecking yards.