How to Replace an [[https://jszst.com.cn/home.php?mod=space&uid=4284583|audi spare key replacement]] G28 Engine Speed Sensor (Image: [[https://g28carkeys.co.uk/wp-content/uploads/2023/10/young-couple-holding-the-keys-of-a-new-car-select-2023-04-03-23-35-08-utc-scaled.jpg|https://g28carkeys.co.uk/wp-content/uploads/2023/10/young-couple-holding-the-keys-of-a-new-car-select-2023-04-03-23-35-08-utc-scaled.jpg]])Charles the Humble Technician teaches how to replace the G28 Engine Speed Sensor. This sensor is located at the top of the transmission, above the flywheel ring gear. It transmits a signal to the ECU via an uncolored wire (T55/49), then to the tachometer within the instrument cluster. (Image: [[https://g28carkeys.co.uk/wp-content/uploads/2023/11/key-from-new-car-2021-08-29-05-15-15-utc-min-scaled.jpg|https://g28carkeys.co.uk/wp-content/uploads/2023/11/key-from-new-car-2021-08-29-05-15-15-utc-min-scaled.jpg]])1. Engine Speed Sensor The grey wire is located at the edges of the transmission, above the flywheel ring. The sensor transmits an electrical signal through the grey wire to pin T55/49. The ECU then uses this information to control fuel, timig and boost. It also sends signals to the G5 tachometer inside the instrument cluster. The sensor is used to link the G40 Camshaft position Sensor. The ecu must know when the crankshaft is TDC and where the camshaft is so it can start spark and injectors according to the situation. If this sensor fails the ECU will show the P00160 error, which means the Crank Shaft and Intake Camshaft aren't in sync and could indicate chain stretch or a jumped link on the upper chain of timing. However the code will not be displayed on its own without additional information from other sensors (G4 and G40). It can be a bit difficult to test since there are different pins on the connector and each has its own functions. The best method for doing this is by measuring the resistance between the ECU and the sensor. When the sensor is fully operational, it should be reading about 1000 ohms. If you are having problems with this part, check for signs of coolant or oil in the connector bay. 2. Injectors Yesterday, while accelerating from the highway paytoll at full speed I noticed a significant drop in power. It was like the engine was running out of gas. Or, my injectors weren't firing. I pulled out the spark plugs this morning, 3 were drenched in gasoline and the fourth was unclean. When i crank the engine without sparks, i place a tissue on the top of each of the injector holes and the 3 that were drenched in gazoline pop out, [[http://www.1moli.top/home.php?mod=space&uid=230002|Replace Audi Key Fob]] but the 4th stay closed. I tried to test the ground connections of ECU pins 14,30, and 48/55. I found zero ohm. I think the issue is elsewhere. I also tried to reset PID without success. The car will start when the G28 is unplugged, and it works fine when the G28 plugged in. However, the intermittent misfire problem 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 pressure gauge in the cockpit shows 2 bar while the actual pressure is 0.0 if i crank up the engine. I'm not sure what to do, but i think i've pretty much ruled out everything else. But i am afraid I may have missed something. Let me know should you have any suggestions! TIA! 3. Fuel Pump The fuel pump on the g28 is activated by a signal sent from the RPM sensor. The GM-style transmitter is similar to the G4 sender and both work on the 80,100,200, UrS, and RS2 vehicles. You can easily find an extra in a wrecking shop or a parts store. Testing them is easy to do - just put 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 must be infinite ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY ADU) engines needs to know the speed and position of the crankshaft to determine timing of the fuel injector, etc. It utilizes a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this. If you have a problem with either one of these, the diagnostic scanner will show the codes that could trigger an engine shut down. A failing G28 sensor can cause an inaccurate speed counter for the gearbox or a gearbox that shifts more quickly than normal, and/or an unfire when in the gear. If you have any of these issues it is most likely that your sensor is deteriorating and requires [[https://www.racingfans.com.au/forums/users/smokeseal12|audi keys replacement cost]]. The good news is that they are quite affordable and readily available, especially when you're looking at a Bosch sensor, which is what ours are. Alternatively, GM's version of this part would be a good option. 5. Tachometer A failing engine sensor could cause a variety of issues in your car. It is a crucial part of the [[https://www.google.com.om/url?q=https://telegra.ph/15-Gifts-For-The-Audi-Key-Lover-In-Your-Life-09-27|audi connect Key]]'s transmission as it sends information to the ECU about how fast or slow the car's crankshaft is rotating. This sensor could cause the transmission to malfunction and other components in the car to be affected. The G5 engine speed sensor is located on the outside of the transmission, above the flywheel ring gear and sends a signal to the ECU at pin T55/49 via a grey wire. The ECU utilizes this signal to regulate fuel and boost, [[https://maps.google.com.qa/url?q=https://www.thehomeautomationhub.com/members/powerbean26/activity/119247/|Audi A4 Replacement Key]] as well as timig. It also transmits it 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 to pin T6a/1 (trace [79]) and between T6a/1 and the instrument cluster pin T26a/12. There should be the resistance to be around 1000 ohms between these two points. This is a standard component across the [[https://www.metooo.it/u/66f6ebb59854826d168427c0|audi new key]] 80, 100 200, UrS and RS2 range from 1985 MC through the 1997 UrS AAN and 1995 RS2 ADU, so the best ones might be availble in wrecking yards.