Do NOT continue driving the vehicle with a flashing check engine light. Driving it could cause further damage and potentially leave you stranded.
Here's what you should do:
1. Get the diagnostic trouble codes (DTCs) read: This is the most crucial step. A flashing check engine light means the car's computer has detected a serious problem and is likely preventing full engine power to protect itself. An OBD-II scanner (available at most auto parts stores, or a mechanic can do it) will read the codes. These codes provide specific information about the problem. Write them down or take a picture.
2. Once you have the codes: You can:
* Look them up online: Many websites (like OBD-II code lookup sites) will explain the possible causes of the codes. However, this is only for informational purposes. A professional diagnosis is still recommended.
* Take it to a mechanic: This is the safest and most reliable option. A mechanic can accurately diagnose the problem based on the codes and a physical inspection of your vehicle.
Possible Causes (speculative, without diagnostic codes):
While it's impossible to know the exact cause without the codes, some possibilities that could explain both the reduced fuel economy and the flashing check engine light include:
* Oxygen sensor failure: A faulty oxygen sensor can cause inaccurate fuel mixture, leading to poor fuel economy and potentially triggering the check engine light.
* Catalytic converter problems: A failing catalytic converter can restrict exhaust flow, impacting performance and fuel economy, and causing the light to flash.
* Mass airflow sensor (MAF) issue: A malfunctioning MAF sensor provides inaccurate air readings to the engine's computer, leading to improper fuel delivery.
* Ignition system problems: Issues like a faulty ignition coil or failing distributor (if applicable) can cause misfires, poor fuel efficiency, and trigger a flashing light.
* Severe vacuum leak: A large leak in the intake system can dramatically reduce engine performance and fuel efficiency.
* Serious internal engine problem: In severe cases, this could involve issues like a failing piston ring, worn cylinder walls, or valve issues. This is a worst-case scenario, but a possibility given the significant drop in gas mileage.
In short: Don't delay. Get the diagnostic codes read immediately and take your Saturn Vue to a qualified mechanic for repair. Ignoring a flashing check engine light can lead to expensive repairs down the road.
