How to Replace an [[https://seolistlinks.com/story19519545/how-audi-spare-key-became-the-hottest-trend-of-2023|audi etron key]] G28 Engine Speed Sensor (Image: [[https://g28carkeys.co.uk/wp-content/uploads/2023/10/Kia-Motors-New-2021.png|https://g28carkeys.co.uk/wp-content/uploads/2023/10/Kia-Motors-New-2021.png]])Charles the Humble Technician teaches you how to replace the G28 Engine Speed Sensor. This sensor is located at the top of the transmission just above the flywheel ring gear. It transmits a signal to the ECU via an uncolored wire T55/49, then to the tachometer in 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 an electrical signal to ECU pin T55/49 through the grey wire. The ECU then uses this information to control the flow of fuel, timig and boost. It also sends an alert to the G5 Tachometer in instrument cluster. The sensor is used as a reference point to connect with the G40 Camshaft Position Sensor. The ecu must know when the crankshaft is TDC and the location of the camshaft so it can trigger spark and injectors according to the situation. If this sensor fails when it fails, the ECU will display a P00160 error code. This means that the Crank Shaft is not in sync with the Intake Camshaft. It could also be a sign of an issue with the chain or a jump in the chain link of the upper chain of timing. The code won't appear without the additional information supplied by other sensors (G4 or G40). It can be a bit difficult to test because there are several connector pins, and they all have different functions. The best method for doing this is by measuring the resistance between the ECU and the sensor. If the sensor is operational, it should read approximately 1000 ohms. If you're having issues with this part, check for evidence of oil or coolant in the connector bay. 2. Injectors Yesterday, while accelerating from the highway paytoll at maximum speed, i noticed a huge decrease in power. It was as if the engine had run out of gas. Or, my injectors were not firing. I pulled out the spark plugs this morning, three were soaked with gasoline and the fourth was dry. I placed a tissue over each injector hole, and when I start the engine without sparks, the ones that have gazoline pop right out. The 4th one stays closed. I checked the ground connection on ECU pins 14/55,30/55 and 48/55 I got zero Ohm. I'm assuming that the issue is somewhere else. I also tried to reset PID but without success. The car will start when the G28 is disconnected, but it runs fine with the G28 plugged in. However the intermittent misfire issue persists at higher RPM. The coolant sensor (G62) even if it is not plugged in, shows an ice temperature of -49c. I also noticed that the oil gauge in the cockpit shows 2 bars while the actual pressure is 0. I'm not certain what to do, but i believe that i've completely ruled out all other possibilities. I'm concerned that i may have missed something. If anyone has suggestions, please share them! TIA! 3. Fuel Pump The fuel pump in the g28 gets a signal from the RPM sensor. The GM-style transmitter functions similarly to the G4 sender and works on the 80,100,200, UrS, and RS2 vehicles. You can easily find an extra in a wrecking shop or a parts store. It is simple to test them - simply switch your DMM into resistance mode and test the distance between pins 1 and 2 (with the bump on the connector's edge facing up). They must be infinite ohms. 4. ECU The ECU of our 20vt turbo (3B AAN ABY) engines needs to know the position and speed of the crankshaft to make decisions regarding timing of fuel injectors, etc. To accomplish this, it uses a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you are experiencing issues with either one of these, the diagnostic scanner will display the codes that could trigger the engine shutting down. A failing G28 sensor can cause an inaccurate gearbox speed counter or a gearbox that shifts more quickly than normal, or a misfire in the gear. If you have any of these problems, it is likely that your sensor is failing and needs replacing. They're cheap and easy to find particularly when they're an Bosch unit like ours. Alternately, GM's version this component is an option. 5. Tachometer A faulty engine speed sensor could be a cause for many problems in your car. It is a crucial part of your [[https://bookmarkspedia.com/story3629435/audi-spare-key-what-s-the-only-thing-nobody-is-talking-about|audi tt key]]'s transmission, since it relays information to the ECU about how fast or slow the vehicle's crankshaft is rotating. If the sensor fails, it could disrupt the performance of the transmission and the rest of the car's components. The G5 engine speed sensor is situated on the edge of the transmission, above the flywheel ring gear. It sends a signal to the ECU at pin T55/49 through a grey wire. The ECU is then able to process the signal to control the flow of fuel, timig and boost, and also transmitting it to the G5 Tachometer located in the instrument cluster. You can check the sensor for any failure by checking the continuity between it and the tachometer. You can also check continuity between ECU pin T55/49 and the instrument cluster connection to pin T6a/1 (trace [79trace [79]) and audi a1 key Fob, [[https://bookmarksurl.com/story3587604/the-little-known-benefits-of-replacement-audi-car-key|bookmarksurl.com]], between T6a/1 and the instrument cluster pin T26a/12. You should detect an average resistance of 1000 ohms in these areas. This is the same across the [[https://socialioapp.com/story3540599/10-facts-about-key-audi-that-insists-on-putting-you-in-good-mood|audi replacement Key service]] 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 might find some good ones in wrecking yards.