my Porsche Cayenne E3 (2018-Present) has a check engine light and poor mileage

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and set the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Address Fault Codes

• Sub-step 1: Document the error codes obtained from the OBD-II scanner.
• Sub-step 2: Research the error codes to determine the likely faulty components.

3. Replace the Air Filter

• Sub-step 1: Locate the engine air filter housing.
• Sub-step 2: Remove the housing cover by unscrewing the retaining clips.
• Sub-step 3: Take out the old air filter and install the new one.
• Sub-step 4: Reassemble the housing cover.

4. Inspect and Replace Spark Plugs

• Sub-step 1: Remove the ignition coil covers if applicable.
• Sub-step 2: Disconnect the ignition coils and remove them.
• Sub-step 3: Use a spark plug socket to remove the spark plugs.
• Sub-step 4: Install new spark plugs, ensuring proper torque specifications (typically around 15 ft-lbs).
• Sub-step 5: Reinstall the ignition coils.

5. Fuel System Check

• Sub-step 1: Connect the fuel pressure gauge to the fuel rail.
• Sub-step 2: Start the engine and monitor fuel pressure; it should be within manufacturer specifications.
• Sub-step 3: If out of specifications, replace the fuel pump or filter as necessary.

6. Exhaust System Inspection

• Sub-step 1: Visually inspect the exhaust system for leaks or damage.
• Sub-step 2: Use a smoke test if necessary to identify hidden leaks.
• Sub-step 3: Repair or replace any damaged components as needed.