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How to Replace an audi spare keys G28 Engine Speed Sensor

Charles the Humble Technician teaches how to replace the G28 Engine Speed Sensor. This sensor is located on the outside of the transmission over the flywheel gear. It transmits a signal the ECU via a grey wire (T55/49), then to the tachometer within the instrument cluster.

1. Engine Speed Sensor

The sensor is located at the edge of the transmission above the flywheel ring gear the G28 Engine Speed Sensor sends an electrical signal to ECU pin T55/49 through an uncolored wire. The ECU utilizes this information to regulate fuel and boost. It also sends a signal 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 needs to know when the crankshaft is TDC and where the camshaft is located so that it can activate spark and injectors accordingly.

If this sensor fails when it fails, the ECU will display a P00160 error message. This indicates that the Crank Shaft is not in alignment with the Intake Camshaft. It could also be a sign of the possibility of a chain stretch or jumped chain link in the upper chain. However, the code won't appear on its own, without additional information from other sensors (G4 and G40).

Testing can be a bit difficult as there are two different connector pins and they perform different functions however the best way to test it is by measuring resistance between the sensor and the ECU. It should read about 1000 ohms if the sensor is in full operation. If you're experiencing issues with this part, check for signs of coolant or oil in the connector bay.

2. Injectors

Yesterday accelerating full speed from highway paytoll, I experienced a big cut in power like the engine is running out of gas or the injectors are not firing anymore. I took out the spark plugs this morning, replace audi key Fob 3 were soaked with gasoline and the fourth was unclean. When I crank the engine, there are no sparks i put tissue on top of each injector hole, the 3 drenched with gazoline pop out, but the 4th stays closed. I tried to test the ground connections of ECU pins 14,30, and [Redirect Only] 48/55. I got 0ohm. I'm assuming the issue is somewhere else.

I also 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 is experiencing intermittent misfires at higher RPM. The coolant sensor (G62), even if it is not plugged in, shows a temperature of -49c. I also noticed that the gauge for oil pressure in the cockpit is showing 2 bar while the actual pressure is 0.0 when I crank up the engine.

I don't know what to do. I believe that I've eliminated everything else. I'm afraid i may have missed something. If anyone has any ideas please share them! TIA!

3. Fuel Pump

The fuel pump in the g28 can be activated by a signal sent from the RPM sensor. The GM-style sender is identical to the G4 and both are used in the 80 100, 200, UrS and RS2 cars which is why you can easily locate one at a salvage yard or from a parts store. It is simple to test them - put your DMM in resistance mode and measure the resistance between pins 1 (with the bump on the connector's side up) and 2 (2nd from the left on the black connector's side). They must be infinite ohms.

4. ECU

Our 20vt turbo (3B AAN, ABY and ADU) engines have an ECU that must know the speed and position of the crankshaft in order to make decisions regarding fuel injector timing etc. It uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this. If either of these go bad you will get codes on the diagnostic scanner which could cause engine shut down.

The signs of a malfunctioning G28 sensor include an inaccurate gearbox rev counter and gears that shift faster than normal, and/or a misfire when you're in gear. If you are experiencing any of these issues it is likely that your sensor is deteriorating and requires replacement audi key fob. They're cheap and easy to find especially if they're an Bosch unit like ours. If you prefer, GM's version of this component is an option.

5. Tachometer

A failing engine speed sensor could be a cause for many problems in your car. It's a crucial component of the transmission in your audi car key holder, as it transmits information to the ECU about how fast or slow the engine of the car is spinning. This sensor could cause the transmission to malfunction and other car components to be affected.

The G5 engine speed sensor is located on the edge of the transmission, [Redirect Only] above the flywheel ring gear. It sends a signal directly to the ECU at pin T55/49 through an uncolored wire. The ECU utilizes this signal to control fuel and boost, and also to timigrate. It also relays it to the G5 Tachometer inside the instrument cluster. You can test the sensor for failure by examining the continuity between it and the tachometer. You can also check continuity between ECU pin T55/49 and the instrument cluster connection to pin T6a/1 (trace [79trace [79]) and between pin T6a/1 and the instrument cluster pin T26a/12. It should show approximately 1000 ohms of resistance between these two points. This is a common feature across the Audi replacement Key cost uk 80-100-200-RS2 model, ranging from the 1985 MC all the way up to the 1997 UrS An and 1995 RS2 DU, so you might find good ones in wrecking yards.