How to Replace an audi q7 replacement key G28 Engine Speed Sensor

In this video, Charles the humble mechanic demonstrates how to replace the G28 engine speed sensor. This sensor is located near the edges of the transmission, above the flywheel ring gear. It transmits a signal to the ECU through the grey wire T55/49 and then to the tachometer in the instrument cluster.

1. Engine Speed Sensor

The grey wire is situated at the edges of the transmission, above the flywheel ring. The sensor transmits a signal via the grey wire to pin T55/49. The ECU then uses this information to control fuel, timig and boost. It also sends an indicator to the G5 Tachometer within the instrument cluster.

The sensor is used to connect the G40 Camshaft position Sensor. The ecu needs to know when the crankshaft is TDC and the location of the camshaft so it can start spark and injectors according to the situation.

If this sensor fails when it fails, the ECU will display a P00160 error message. This means that the Crank Shaft is out of alignment with the Intake Camshaft. It could also indicate an issue with the chain or a jump in the chain link of the upper chain of timing. The code won't appear without the additional information provided by other sensors (G4 or G40).

Testing can be a bit difficult as there are two different connector pins and they serve different purposes but the most effective way to test it is to measure the resistance between the sensor and the ECU. It should read around 1000 ohms when it is at full operation. If you're experiencing issues with this component, look for signs of oil or coolant in the connector bay.

2. Injectors

Yesterday accelerating full speed from highway paytoll i had an abrupt drop in power like the engine is running out of gas or the injectors aren't firing at all. I pulled out the spark plugs this morning and found that 3 were soaked with gasoline and the fourth was dry. I put tissue over each injector hole, and when I start the engine without sparks, the ones with gazoline jump right out. The 4th one stays closed. I tried to test the ground connections of ECU pins 14,30 and 48/55. I found 0ohm. I assume that the problem is somewhere else.

I also tried to reset the PID without success. The car can start when the G28 is disconnected and it runs perfectly when it is plugged in, but still is experiencing intermittent misfires at higher RPM. The coolant sensor (G62), even when it is unplugged, shows temperatures of -49c. Also, i noticed that the oil pressure gauge 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, as i think i've pretty much ruled out everything else. But i am afraid I might have missed something. If anyone has suggestions, please share them! TIA!

3. Fuel Pump

The fuel pump of the g28 receives signals from the RPM sensor. The GM-style transmitter functions similarly to the G4 sender, and both operate on the 80,100,200, UrS, and RS2 vehicles. You can easily locate the spare in a salvage shop or parts store. It is simple to test them: simply switch your DMM into resistance mode and determine the distance between pins 1 and 2 (with the bump at the connector end facing upwards). They must be infinite Ohms.

4. ECU

Our 20vt turbo (3B AAN, ABY, and ADU) engines have an ECU that has to be aware of the speed and position of the crankshaft to make decisions regarding fuel injector timing etc. To do this, it uses a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you have a problem with either of these sensors, the diagnostic scanner will show codes that could cause an engine shutdown.

A failing G28 sensor could cause an inaccurate speed counter for the gearbox or a gearbox that shifts more quickly than normal, and/or a misfire in gear. If you are experiencing any of these issues it is likely your sensor is failing and needs replacing. The good news is they are very cheap and easily accessible, especially in the case of an Bosch model, which is what ours are. Alternatively, GM's version of this part is a good option.

5. Tachometer

A faulty engine speed sensor could be the reason behind a slew of issues with your car. It's an essential component of the transmission of your audi key fob replacement key cost [longshots.wiki] because it relays information to the ECU about how fast or slow the engine of the car is turning. This sensor can cause the transmission to malfunction and other components of the car to be affected.

The G5 engine speed sensor is situated on the edge of the transmission above the flywheel ring gear. It transmits a signal to the ECU at pin T55/49, via an uncolored wire. The ECU uses this signal to control fuel and boost, and also to timigrate. It also relays it to the G5 Tachometer in instrument cluster. You can determine if the sensor is in failure by examining the continuity of the sensor to the tachometer. Also, you can examine the continuity between pins T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79]), and between pin T6a/1 as well as pin T26a/12. You should detect the resistance to be around 1000 ohms between these points. This is the same across the audi a1 key 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.