Usually it comes up because someone didn't close the gas cap tightly (3-clicks!) and its not a big deal. Worst case you might have to replace the canister which is expensive. Sometimes a hose gets accidentally disconnected (or not reconnected) when someone does a sloppy air filter change. In that case, just reattached the hose and you should be good to go.
You can either fix whatever problem is causing it, or have it reset with a code reader. If you reset it with a code reader, chances are it will come back on.
Don't fix them, replace them. Its an easy job, see related link.
Buy a grand prix
You may simply need to clean the MAF Sensor. Simple fix.
To fix a P0172 code indicating a system too rich condition on a 2001 Toyota Echo, start by checking for vacuum leaks, as they can cause incorrect air-fuel mixture readings. Inspect the fuel system for issues such as a clogged fuel filter, failing fuel injectors, or a malfunctioning fuel pressure regulator. Additionally, examine the mass air flow (MAF) sensor for dirt or damage, and ensure that the engine's coolant temperature sensor is functioning properly. After addressing any identified issues, clear the code and test drive the vehicle to see if the code returns.
How to fix e 71-1
To fix a Toyota Echo trunk release, start by checking the fuse associated with the trunk release system in the fuse box; if it’s blown, replace it. Next, inspect the trunk release button and the wiring for any visible damage or loose connections. If the button is faulty, it may need to be replaced. If the issue persists, consider consulting a professional mechanic to diagnose any deeper electrical problems.
To fix the trunk release lever in a 2003 Toyota Echo, first, check the lever's connection to the cable and ensure it isn't disconnected or damaged. If the cable is intact, inspect the lever itself for any signs of wear or breakage. If necessary, replace the lever or cable by removing the trim panel in the trunk area for access. Reassemble everything and test the lever to ensure it functions properly.
This code is for the transmission The Direct clutch speed sensor. Have it tested most likely it has to be replaced. Had the same problem myself and managed to fix it by replacing the sensor.
When I asked how much it would cost to replace the gear shift light on a Toyota Echo, I was quoted about $100 from the dealership! (Most of the cost is labor).
EVAP, charcoal canister not being purged, usually this is a simple fix a vacuum line
Toyota has released a TSB on this . You have to take it to Toyota and have the catalytic converter replaced and the ECM reflashed. And if you have over 80000 miles on it, you also have to pay for it.