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S54 Exhaust Gas Sensor Replacement
 
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Pelican Technical Article:

S54 Exhaust Gas Sensor Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

****

Tools:

17mm wrench

Applicable Models:

BMW E46 M3 Coupe/Conv (2006)
BMW Z4 Coupe/Conv (2006)

Parts Required:

Exhaust Gas sensor, anti-seize paste

Hot Tip:

Work with a cool exhaust

Performance Gain:

Remedy fault codes and maintain proper running engine

Complementary Modification:

Replace O2 sensors

The exhaust gas temperature (EGT) sensor is mounted in the exhaust header on BMW Z4M models with an S54 engine. The exhaust gas temperature sensor is used to monitor exhaust gas temperature. The temperature data is used by the DME to calculate mixture and keep catalyst function in the right range. The sensors can fail setting fault codes, P0546 or BMW FC-79. The sensor is a simple two wire resistor, resistance changes in relation to temperature.

EGT sensors should be replaced every 100,000 miles. In a perfect world that would be it. Wait until a specified mileage and replace the sensor. However, these sensors fail prematurely, requiring replacement.

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The exhaust gas temperature (EGT) sensor is mounted in the exhaust header (red arrow) on BMW Z4M models with an S54 engine.
Figure 1

The exhaust gas temperature (EGT) sensor is mounted in the exhaust header (red arrow) on BMW Z4M models with an S54 engine. The exhaust gas temperature sensor is used to monitor exhaust gas temperature. The temperature data is used by the DME to calculate mixture and keep catalyst function in the right range. The sensors can fail setting fault codes, P0546 or BMW FC-79. The sensor is a simple two wire resistor, resistance changes in relation to temperature.

To make room to work, remove the secondary air pump and hoses, see our tech article on secondary components replacing.
Figure 2

To make room to work, remove the secondary air pump and hoses, see our tech article on secondary components replacing. Start by removing the crankcase breather hose. Disconnect the electrical connector (inset) by pressing the wire release and pulling the connector straight off. Then lift the solenoid (green arrow) up and out of the mounting bracket. Next, detach the breather hoses from the intake and breather (red arrows).

To remove the breather hoses, squeeze the collar and pull straight up.
Figure 3

To remove the breather hoses, squeeze the collar and pull straight up.

Place breather hose and solenoid aside (green arrow).
Figure 4

Place breather hose and solenoid aside (green arrow). You can leave the rubber hose attached. It only has to be moved enough to make room for the engine cover to come out.

Remove the six 10mm engine cover fasteners (red arrows).
Figure 5

Remove the six 10mm engine cover fasteners (red arrows). Then remove the oil filler cap (green arrow).

Lift and remove the engine cover.
Figure 6

Lift and remove the engine cover.

Working at the rear corner of the cylinder head, pull the wiring harnesses (red arrows) out of the holders.
Figure 7

Working at the rear corner of the cylinder head, pull the wiring harnesses (red arrows) out of the holders.

Working at the rear corner of the cylinder head near the camshaft sensor (purple arrow), remove the 13mm heat shield fastener (red arrow).
Figure 8

Working at the rear corner of the cylinder head near the camshaft sensor (purple arrow), remove the 13mm heat shield fastener (red arrow).

Then, remove the three 10mm fasteners (purple arrows) then remove the secondary air check valve, remove the 13mm heat shield fasteners (red arrows).
Figure 9

Then, remove the three 10mm fasteners (purple arrows) then remove the secondary air check valve, remove the 13mm heat shield fasteners (red arrows).

Working at the rear corner of the cylinder head, pull the wiring harnesses (red arrow) out of the heat shield.
Figure 10

Working at the rear corner of the cylinder head, pull the wiring harnesses (red arrow) out of the heat shield.

Lift and remove the heat shield (red arrow).
Figure 11

Lift and remove the heat shield (red arrow).

Locate the EGT sensor electrical connectors at the rear of the cylinder head (red arrow).
Figure 12

Locate the EGT sensor electrical connectors at the rear of the cylinder head (red arrow).

Unclip and lift up the wiring harness housing.
Figure 13

Unclip and lift up the wiring harness housing. Squeeze the tabs (red arrows) and flip up. Then remove the electrical connector for the EGT sensor from the holder. Disconnect the electrical connector by squeezing the release tab and pulling it apart (inset).

Using a 17mm wrench, loosen the sensor (red arrow).
Figure 14

Using a 17mm wrench, loosen the sensor (red arrow). Use a swift motion to break it free. Sometimes they get stuck.

Unscrew the sensor (red arrow) and remove it from the exhaust header.
Figure 15

Unscrew the sensor (red arrow) and remove it from the exhaust header. Reverse steps to install new sensor. Apply a small amount of anti-seize paste on the threads of the nut. Then reassemble the engine covers and clear any engine fault codes using a BMW scan tool.

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Page last updated: Fri 12/9/2016 03:01:57 AM