my BMW 3 Series E90/E91 makes a clicking noise when trying to start, what's wrong?

BMW 3 Series E90/E91 (2005-2012)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

516 words

Problem Statement

The BMW 3 Series E90/E91 is experiencing a clicking noise when attempting to start the engine, indicating a potential issue with the starting system.

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the vehicle is in park or neutral with the parking brake engaged before starting repairs.

Symptoms

•Clicking noise when the ignition is turned on
•Engine fails to crank or start
•Dashboard lights dim or flicker during starting attempt
•Battery warning light illuminated
•Possible intermittent electrical issues

Diagnostic Steps

1
Check the battery voltage using a multimeter; it should be above 12.4 volts.
2
Inspect battery terminals for corrosion or loose connections.
3
Test the starter motor by bypassing it with a jumper wire.
4
Use an OBD-II scanner to check for any related fault codes.
5
Assess the condition of the ignition switch and relays related to the starting system.
6
Inspect the wiring and connections from the battery to the starter for any damage.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Wire brush
•wrenches.

Parts Required

•New battery (if applicable)
•Starter motor (if applicable)

Related Faults

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Diagnostic Steps

1
Check the battery voltage using a multimeter; it should be above 12.4 volts.
2
Inspect battery terminals for corrosion or loose connections.
3
Test the starter motor by bypassing it with a jumper wire.
4
Use an OBD-II scanner to check for any related fault codes.
5
Assess the condition of the ignition switch and relays related to the starting system.
6
Inspect the wiring and connections from the battery to the starter for any damage.

Solution

1. Preparation

Gather tools and ensure the vehicle is in a safe, well-ventilated area.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Battery Inspection

Sub-step 1: Clean any corrosion from the battery terminals using a wire brush.
Sub-step 2: Tighten the battery terminal connections to ensure a good electrical contact.
Tools Required: Wire brush, wrenches.

3. Battery Replacement (if needed)

Sub-step 1: If the battery voltage is low, remove the old battery by disconnecting the negative terminal first followed by the positive terminal.
Sub-step 2: Install the new battery by connecting the positive terminal first, then the negative terminal.
Sub-step 3: Check for proper fit and secure the battery hold down.
Tools Required: Wrench set.

4. Starter Motor Inspection

Sub-step 1: Locate the starter motor (usually near the transmission).
Sub-step 2: Remove the electrical connections from the starter (note their positions).
Sub-step 3: Test the starter motor with a multimeter to confirm it engages when power is applied.
Sub-step 4: If faulty, remove the starter motor and replace it with a new or refurbished unit.
Tools Required: Socket set, multimeter.

5. Final Assembly

Sub-step 1: Reconnect all electrical connections securely.
Sub-step 2: Reconnect the negative battery terminal.
Sub-step 3: Start the vehicle to ensure it operates correctly.