BMW Eccentric Shaft Sensor 11377506503

BMW Eccentric Shaft Sensor 11377506503 – Valvetronic Sensor for BMW 1, 3 Series, X1, X3, Z4

Dhs. 242.23

This BMW eccentric shaft sensor is a replacement sensor listed under BMW part number 11377506503. It is the sensor that reports the position of the eccentric shaft in BMW's Valvetronic variable valve lift system. The supplier lists it for BMW 1 Series, 3 Series, X1, X3 and Z4 models. Easy Life Markets sells it as a single, new replacement sensor for owners and workshops fixing Valvetronic faults.

The original supplier title called this a "crankshaft phase eccentric shaft sensor". It does not read the crankshaft. It reads the eccentric shaft in the cylinder head, so we have named it clearly as an eccentric shaft sensor to avoid confusion with a crankshaft position sensor.

What the Eccentric Shaft Sensor Does

On BMW engines with Valvetronic, engine power is controlled mainly by changing how far the intake valves open, instead of relying only on a throttle plate. An electric motor turns an eccentric shaft in the cylinder head to change the intake valve lift. The eccentric shaft sensor tells the engine computer the exact angle of that shaft, so the computer can set the correct valve lift for the throttle position. This is a form of variable valve timing and lift.

If the sensor signal is lost or implausible, the engine computer usually switches to a back-up mode, which often means reduced power, a rough idle and a warning light.

What Is Included

1 x eccentric shaft sensor

The product photos show the black sensor housing with its mounting points and electrical connector, and a dimension drawing.

Specifications

Product type: Eccentric shaft sensor (Valvetronic position sensor)
Part number: 11377506503
Listed models: BMW 1 Series, 3 Series, X1, X3, Z4
Color: Black
Quantity: 1 sensor
SKU: CJYD194351701AZ

Checking Fitment

BMW fitted Valvetronic to several petrol engine families, and the eccentric shaft sensor part number can change with engine type and build date. The supplier gives model ranges but not engine codes or years. Before ordering:

Check the part number on your old sensor, or look up your car in a BMW parts catalogue using the last seven characters of your VIN.
Look for a superseded number. BMW sometimes replaces part numbers with newer ones. Your catalogue lookup will show whether 11377506503 is listed for your car.
Compare the photos with your sensor: housing shape, mounting holes and connector.

If you need help, send us your VIN and we will check it against the part number.

Signs of a Failing Eccentric Shaft Sensor

Check engine or drivetrain warning light with an eccentric shaft or Valvetronic fault code
Reduced engine power or limp mode
Rough or unstable idle
Hesitation when accelerating
Oil in the sensor connector, which is a common cause of faults on these sensors

Similar symptoms can also come from the Valvetronic motor, its wiring, or a leaking valve cover gasket that lets oil into the sensor or connector. Read the fault codes and inspect the wiring before replacing the sensor.

Installation Tips

Let the engine cool and disconnect the battery.
On many models the sensor sits on the cylinder head under the valve cover area. Access and the removal steps vary by engine, so follow the service information for your car.
Take care not to drop screws or dirt into the cylinder head.
Fit the new sensor, reconnect the plug and use new seals or gaskets where required.
Clear the fault codes. Some cars need a Valvetronic adaptation or relearn with a suitable diagnostic tool after replacement.

Because this job may involve removing the valve cover, many owners have it done by a workshop that has BMW diagnostic equipment.

Fix the Oil Leak Too

A very common reason for eccentric shaft sensor faults on BMW engines is oil from a leaking valve cover gasket reaching the sensor or its connector. If you find oil around the sensor, replace the valve cover gasket at the same time, clean the connector thoroughly, and check that the wiring is dry. Otherwise, the new sensor may fail for the same reason.

Who This Sensor Is For

This sensor suits BMW owners who carry out their own repairs, independent BMW specialists, and anyone replacing a failed eccentric shaft sensor with a matching part number.

Common Questions

Is this a crankshaft sensor? No. It is an eccentric shaft sensor for the Valvetronic system. BMW crankshaft sensors are separate parts.

Is this a genuine BMW part? No. It is an aftermarket replacement sold under the BMW reference number 11377506503.

Buy the BMW Eccentric Shaft Sensor at Easy Life Markets

You can order this eccentric shaft sensor right here. The current price and availability are shown on this page. Please read our return and refund policy before buying.