(Image: [[https://g28carkeys.co.uk/wp-content/uploads/2023/10/Lexus.jpg|https://g28carkeys.co.uk/wp-content/uploads/2023/10/Lexus.jpg]])How to Replace an [[https://bookmarksden.com/story18318719/20-rising-stars-to-watch-in-the-audi-spare-key-industry|audi replacement key fob]] G28 Engine Speed Sensor Charles the Humble Technician shows you how to [[https://autolocksmith03210.bloggadores.com/29611395/indisputable-proof-you-need-audi-advanced-key|replace audi key fob]] 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 an uncolored wire T55/49, then to the tachometer in the instrument cluster. 1. Engine Speed Sensor The grey wire is located on the edge of transmission, above the flywheel ring. This sensor sends an electrical signal through the grey wire to pin T55/49. The ECU then utilizes this information to regulate fuel, timig and boost. It also sends an indication to the G5 Tachometer in instrument cluster. The sensor is used to correlate with the G40 Camshaft position Sensor. The ecu must know when the crankshaft is TDC and where the camshaft is so it can activate spark and injectors according to the situation. If this sensor fails the ECU will throw the P00160 error, which means the Crank Shaft and Intake Camshaft are not in sync, [[https://explorebookmarks.com/story18152619/10-things-you-learned-in-kindergarden-that-will-help-you-get-audi-g28|audi a1 Keys]] possibly indicating the chain stretching or a jump link on the upper chain of timing. The code won't appear without the additional information supplied by other sensors (G4 or G40). Testing is a bit challenging because there are two connector pins, and they serve different purposes but the best method of testing it is by measuring resistance between the sensor and the ECU. If the sensor is operational, it should be reading around 1000 ohms. Check for signs of coolant, or oil in the connector bay if you have issues with this part. 2. Injectors Yesterday, while accelerating from the highway paytoll at maximum speed I noticed a significant decrease in power. It was as if the engine was running out of gas. Or my injectors were not firing. I pulled out the spark plugs this morning, three were soaked in gasoline, and the fourth was unclean. I placed a tissue over each injector hole and when i start the engine without sparks, the ones with gazoline jump out. The 4th one remains closed. I tested the ground connection on ECU pins 14/55,30/55 and 48/55 i get zero Ohm. Therefore, i think the issue is in another place. I also tried to reset the PID without success. The car will start when the G28 is unplugged, and it runs fine with the G28 plugged in. However, the intermittent misfire problem continues to occur at higher RPM. The temperature sensor for the coolant (G62) shows the wrong temperature of -49c even when i unplug it. I also noticed that the gauge for oil pressure in the cockpit shows 2 bar while the actual pressure is 0.0 when i rev the engine. I'm not certain what to do, i think i've pretty much completely ruled out all other possibilities. I'm concerned that i may have missed something. Let me know If you have any suggestions! TIA! 3. Fuel Pump The fuel pump of the g28 gets a signal from the RPM sensor. The GM-style transmitter is the same as the G4 and both function in the 80 100 200, UrS and RS2 cars which is why you can easily locate one at a salvage yard or in a local parts store. It is simple to test them by putting your DMM in resistance mode and take measurements 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 should be infinite ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY) engines must know both the position and speed the crankshaft to make decisions regarding timing of the fuel injector, etc. To do this, it uses a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you encounter a problem with either one of these, the diagnostic scanner will show codes that could lead to the engine shutting down. A damaged G28 sensor could result in an inaccurate speed counter for the gearbox and a gearbox which shifts faster than normal, and/or a misfire while in gear. It is possible that your 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 easy to find particularly if you're looking at the Bosch unit like ours. Alternatively, the GM version of this component is also a good option. 5. Tachometer A malfunctioning engine speed sensor could be a cause for a slew of issues with your car. It is a crucial part of your [[https://bookmarklinking.com/story3850291/7-helpful-tricks-to-making-the-maximum-use-of-your-audi-advanced-key|audi a3 key fob replacement]]'s transmission, because it communicates to the ECU about how fast or slow the car's crankshaft is turning. If the sensor fails, it could disrupt the performance of the transmission, as well as the other car's components. The G5 engine speed sensor is located at the edge of the transmission above the flywheel ring gear and sends a signal to the ECU at pin T55/49 through a grey wire. The ECU then processes the signal to control the flow of fuel, timig and boost as well as sends it on to the G5 tachometer inside the instrument cluster. You can check for sensor failure by checking continuity from the sensor to the tachometer. You can also verify continuity between pin T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79trace [79]) and between pin T6a/1 as well as pin T26a/12. You should see the resistance to be around 1000 ohms between these points. This is a standard part that is found across the [[https://bookmark-search.com/story18076223/what-s-holding-back-from-the-audi-key-industry|audi new Key]] 80, [[https://socialwebconsult.com/story3535600/three-common-reasons-your-audi-keys-isn-t-working-and-how-to-fix-it|audi key fob replacement cost]] 100, 200, UrS and RS2 range from 1985 MC through the 1997 UrS AAN and 1995 RS2 ADU. Good parts could be found in wrecking yards.