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How to Replace an Audi G28 Engine Speed SensorIn this video Charles the Humble Mechanic demonstrates how to replace the G28 engine speed sensor. This sensor is situated on the outside of the transmission just above the flywheel gear. It transmits a signal the ECU via an uncolored wire (T55/49), then to the tachometer in the instrument cluster.1. Engine Speed SensorThe grey wire is situated on the outside of the transmission, directly above the flywheel ring. The sensor sends signals through the grey wire to pin T55/49. The ECU uses this information to regulate fuel and boost. It also sends an indication to the G5 tachometer in the instrument cluster.The sensor serves as a reference point to connect with the G40 Camshaft Position Sensor. The ecu must be aware of when the crankshaft has reached TDC and also the location of the camshaft to trigger the spark and injectors.If this sensor fails, the ECU will show the P00160 error, which means the Crank Shaft and Intake Camshaft are out of sync and could indicate the chain stretching or a jump link on the upper timing chain. However, the error code won’t be displayed on its own without additional information from other sensors (G4 and G40).Testing is a bit tricky since there are two pins for the connector and they have different functions however the best way to test it is by measuring resistance between the sensor and the ECU. If the sensor is functional, it should read about 1000 ohms. Examine for evidence of coolant or oil in the connector bay if there are problems with this part.2. InjectorsYesterday, while accelerating at full speed from the highway paytoll, I experienced an abrupt drop in power like the engine is running out of gas or the injectors aren’t firing at all. Today, i pulled out the spark plugs. Three were drenched with gazoline the 4th one was dry. I placed a tissue over each injector hole, and when i turn the engine on without sparks, the ones with gazoline jump out. The 4th one stays shut. I tried to test the ground connections of ECU pins 14,30 and 48/55. I got zero ohm. Therefore, i think the issue is in another place.I also tried to reset PID but without success. The car will start when the G28 is unplugged, and it is running fine with the G28 connected. However the intermittent misfire issue continues to occur at higher RPM. The coolant sensor (G62), even when unplugged, still shows temperatures of -49c. Also, i noticed that the gauge for oil pressure in the cockpit shows 2 bar when the actual pressure is 0.0 if i crank up the engine.I’m not sure what to do, as i think i’ve pretty much completely ruled out all other possibilities. However, i’m afraid that i might have missed something. Please let me know should you have any suggestions! TIA!3. replacement car key audi G28CarKeys on the g28 is activated by a signal sent by the RPM sensor. The GM-style sensor is identical to the G4 and both function in the 80 100 200, UrS and RS2 cars which is why you can easily locate one at a wrecking yard or in a local 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 at the connector’s end facing upwards). They must be infinite Ohms.4. ECUThe ECU of our 20vt turbo (3B AAN ABY) engines must be aware of the position and speed of the crankshaft in order to make a decision about fuel injector timing, etc. It uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this. If you have a problem with either of these, the diagnostic scanner will display codes that could cause an engine shutdown.A malfunctioning G28 sensor could cause an inaccurate gearbox speed counter and a gearbox which shifts more quickly than normal, or a misfire while in gear. If you experience any of these issues, it is likely that your sensor is going bad and requires replacement. They are cheap and easy-to-find particularly when they’re a Bosch model like ours. Alternately, the GM version of this part is also a good option.5. TachometerA faulty engine speed sensor could be the cause of a slew of problems in your car. It’s a crucial component of the transmission in your Audi since it sends information to the ECU about how fast or slow the engine of the car is turning. If this sensor fails, it will affect the performance of the transmission as well as the other car’s components.The G5 engine speed sensor is located on the edge 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 then processes this signal to control fuel, timig and boost as well as transmitting it to the G5 tachometer in the instrument cluster. You can check the sensor for failure by examining the continuity between it and the tachometer, between ECU pin T55/49 and the instrument cluster connection via pin T6a/1 (trace [79trace [79]) and between T6a/1 and the instrument cluster pin T26a/12. You should observe approximately 1000 ohms resistance between those two pins. This part is common across the Audi 80-100-200-RS2 range, beginning with the 1985 MC and up to the 1997 UrS An and 1995 RS2 Du You may also find good ones in wrecking yards.