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https://click4r.com/posts/g/18017742/7-simple-tricks-to-refreshing-your-audi-car-keys
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 The sensor is situated on the edge of the transmission above the flywheel ring gear It transmits a signal to the ECU via an uncolored wire T5549 then to the tachometer in the instrument cluster 1 Engine Speed Sensor Located on the edge of the transmission above the flywheel ring gear the G28 Engine Speed Sensor sends a signal to ECU pin T5549 via a grey wire The ECU then utilizes this information to regulate the boost fuel and timig It also sends signals to the G5 tachometer in the instrument cluster The sensor is used to connect the G40 Camshaft position Sensor The ecu needs to know when the crankshaft has reached TDC and also the location of the camshaft in order to activate the spark and injectors If this sensor fails to function the ECU will display an error code P00160 This indicates that the Crank Shaft is not in line with the Intake Camshaft It could also be a sign of a chain stretch or a jumped chain link in the upper timing chain However the code wont be displayed on its own without additional information from other sensors G4 and G40 It can be a bit difficult to test because there are different pins on the connector and each has its own functions The best method for doing this is to measure the resistance between the ECU and the sensor When the sensor is operational it should read about 1000 ohms If youre experiencing issues with this sensor look for signs of coolant or oil in the connector bay 2 Injectors Yesterday while accelerating at full speed from the highway paytoll i had an abrupt drop in power like the engine is out of gas or injectors arent firing anymore audi car key replacement pulled out the spark plugs this morning and found that 3 were soaked with gasoline and the 4th was dry When i crank the engine there are no sparks I put a piece of tissue on the top of each of the injector holes and the 3 drenched with gazoline pop out but the 4th stays closed I tried to test the ground connections of ECU pins 1430 and 4855 I got 0ohm So i assume the problem is elsewhere I also tried to reset the PID without success The car can start when the G28 is not plugged in and it runs perfectly when it is plugged in but still is experiencing intermittent misfires at higher RPM The coolant sensor G62 even if it is not plugged in shows an ice temperature of 49c Also i noticed that the gauge for oil pressure in the cockpit is showing 2 bar whereas the actual pressure is 00 when i rev the engine Im not sure what to do I think Ive all other possibilities out Im concerned that i may have missed something Please let me know If you have any suggestions TIA 3 Fuel Pump The fuel pump on the g28 is activated by a signal from the RPM sensor The GMstyle sender is the same as the G4 and both are used in the 80 100 200 UrS and RS2 cars so you can easily find one at a salvage yard or from a parts store It is easy to test them simply put your DMM into resistance mode and measure the distance between pins 1 and 2 with the bump at the connector end facing up They must be infinite Ohms 4 ECU The ECU in our 20vt turbo 3B AAN ABY engines requires to be aware of the position and speed of the crankshaft in order to make a decision about fuel injector timing etc To accomplish this it utilizes a Crank Position Sensor G4 and an Engine Speed Sensor G28 If either of these go wrong you will receive codes on the diagnostic scanner that can lead to engine shutdown A failing G28 sensor could result in an inaccurate speed counter for the gearbox and a gearbox which shifts faster than normal andor a misfire while in gear If you have any of these issues it is likely your sensor is going bad and needs replacing Theyre inexpensive and easy to locate particularly in the case of an Bosch sensor like ours If you prefer GMs version of this part would be an excellent choice 5 Tachometer A malfunctioning engine sensor can cause a myriad of issues in your car It is an important part of the transmission in your Audi since it sends information to the ECU about how fast or slowly the cars engine is turning 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 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 regulate fuel and boost as well as timig It also sends it to the G5 Tachometer in instrument cluster You can check for sensor failure by checking continuity from the sensor to the tachometer Also you can verify continuity between pin T5549 of the ECU and pin T6a1 of the instrument cluster trace 79 and between pin T6a1 as well as pin T26a12 You should detect the resistance to be around 1000 ohms in these areas This is a common part across the Audi 80 100 200 UrS and RS2 range from 1985 MC to the 1997 UrS AAN and 1995 RS2 ADU so good ones might be availble in wrecking yards