my Jaguar XF X260 (2015-2024) exhaust smells like gas what's the cause

Symptoms

• Strong gasoline odor from the exhaust
• Poor fuel economy
• Engine misfire or rough idle
• Check engine light illuminated
• Excessive carbon buildup around the tailpipe

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to identify potential fault codes related to fuel system or combustion issues.
2. Inspect fuel injectors for leaks or malfunctions, ensuring they are functioning correctly.
3. Check the fuel pressure using a fuel pressure gauge to confirm if it is within manufacturer specifications.
4. Inspect the air-fuel mixture ratio by checking the mass airflow sensor (MAF) and oxygen sensors for proper operation.
5. Examine the exhaust system for any signs of leaks that could introduce unburned fuel into the exhaust stream.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts during diagnostic or repair work.
• Ensure the vehicle is on a level surface and use wheel chocks for safety.

2. Inspect and Replace Fuel Injectors

• Sub-steps:
  1. Remove the engine cover (if necessary) using a socket set.
  2. Disconnect the fuel injector electrical connectors carefully.
  3. Remove the fuel rail by loosening the bolts and lifting it off the injectors.
  4. Pull out the fuel injectors from the rail and inspect for leaks or damage.
  5. Replace any faulty injectors with new ones, ensuring proper alignment and fit.
  6. Reassemble the fuel rail and reconnect all electrical connectors.

3. Check and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors in the exhaust system.
  2. Disconnect the wiring harness from the sensors.
  3. Use an oxygen sensor socket to remove the sensors.
  4. Install new oxygen sensors, ensuring they are torqued to manufacturer's specifications (usually around 30 lb-ft).
  5. Reconnect the wiring harness to the sensors.

4. Inspect and Clean Mass Airflow Sensor (MAF)

• Sub-steps:
  1. Locate the MAF sensor between the air filter and throttle body.
  2. Disconnect the electrical connector and remove the MAF from the air intake tube.
  3. Use MAF cleaner to spray the sensing element and allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.