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How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic shows how to replace the G28 engine speed sensor This sensor is located at the edge of transmission above the flywheel gear It sends a message to the ECU via a grey wire T5549 then to the tachometer located on the instrument cluster 1 Engine Speed Sensor It is located on the outside of the transmission just above the flywheel ring gear G28 Engine Speed Sensor sends a signal to ECU pin T5549 via an uncolored wire The ECU then uses this information to control the boost fuel and timig It also sends an indication to the G5 tachometer in the instrument cluster The sensor is used as a reference for comparing with the G40 Camshaft Position Sensor The ecu needs to know when the crankshaft has reached TDC and the location of the camshaft to trigger the spark and injectors If this sensor fails the ECU will throw a P00160 code which means the Crank Shaft and Intake Camshaft arent in sync and could indicate chain stretch or a jumped link on the upper timing chain The code will not appear without the additional information provided by other sensors G4 or G40 It is a little tricky to test because there are various pins on the connector and each has its own functions The most effective method to test it is to measure the resistance between the ECU and the sensor It should read approximately 1000 ohms if the sensor is operating at its maximum Look for signs of coolant or oil in the connector bay if you have issues with this component 2 Injectors Yesterday while accelerating at full speed from the highway paytoll i experienced massive power loss as if the engine was running out of gas or the injectors are not firing any more I took out the spark plugs this morning and found that 3 were soaked in gasoline and the fourth was dry I put tissue over each hole in the injector and when I turn the engine on without sparks the 3 that have gazoline pop right out The fourth one remains closed I checked the ground connection of ECU pins 1430 and 4855 replacement car key audi got 0ohm Im assuming the issue is elsewhere audi a1 key replacement tried to reset the PID without success The car will start if the G28 is unplugged and it runs perfectly when it is connected however it has the intermittent misfire issue 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 bars when the actual pressure is 0 Im not sure what to do I feel like ive pretty much all other possibilities out Im worried that i might have missed something If anyone has suggestions please share them TIA 3 Fuel Pump The fuel pump in the g28 is activated by a signal from the RPM sensor The GMstyle transmitter is similar to the G4 sender and both operate on the 80100200 UrS and RS2 vehicles You can easily locate a spare in a wrecking shop or parts store Test them out to do just put your DMM in resistance mode and take measurements between pins 1 with the bump on the connectors side up and 2 2nd from left on the black end of the connector They must be infinite Ohms 4 ECU The ECU in our 20vt turbo 3B AAN ABY ADU engines requires to be aware of the position and speed the crankshaft to determine timing of fuel injectors 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 badly you will see codes on the diagnostic scanner which can lead to engine shutdown A failing G28 sensor can cause an inaccurate speed counter for the gearbox and a gearbox which shifts faster than normal or a misfire while in gear If you experience any of these issues it is most likely that your sensor is going bad and should be replaced Theyre cheap and easy to find especially in the case of an Bosch unit like ours Alternatively the GM version of this unit is also a good option 5 Tachometer A damaged engine sensor could cause a number of problems in your car It is an important part of the transmission in your Audi because it relays information to the ECU on how fast or slowly the cars engine is spinning This sensor could cause the transmission to fail and other components in the car to be affected The G5 engine speed sensor is located on the outside of the transmission just above the flywheel ring gear It transmits a signal to the ECU at pin T5549 via a grey wire The ECU uses this signal to control the flow of fuel and boost and also timig It also sends it to the G5 Tachometer located in the instrument cluster You can test for sensor failure by examining the continuity of the sensor to the tachometer You can also examine the continuity between pins T5549 of the ECU and pin T6a1 of the instrument cluster trace 79trace 79 and between pin T6a1 and pin T26a12 You should observe approximately 1000 ohms of resistance between these two points This is a common feature across the Audi 80100200RS2 range 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