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What's a great buy it once Android app?
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Torque and a $5 BT car computer dongle. It tells you everything about your car. You can see what warning lights mean and clear the codes.
What are the main things you use it for? All I ever do is change tires and oil. Both my cars are old, but have never broken down.
I'm not the person you replied to, but it's great for telling you why the check engine light is on. If you're somewhere that requires emission testing: you can diagnose if you have an exhaust leak, bad O2 sensor, clogged catalytic converter, etc. Besides that: its good just to know if the check engine light can be safely ignored.
Nice, fortunately my check engine light has never been on, but when it comes on, I'm doing this!