Have 2005 chevy trailblazer check engine light came on. Mechanic say it is fuel evapor lock changed fuel cap week later light came on again

SOURCE: 2006 Chevy Aveo Check Engine Light coming on and off

It needs a code scanner hooked up to it,to tell you why the light is on and the cause. If there is an autozone near you take it there or
call different auto part stores to find out if they do that.Without getting the code, it's just guessing what the problem is.

Marvin

• 85242 Answers
• Posted on Feb 26, 2009

SOURCE: check engine light code PO456

most likely the pressure sensor in the fuel tank for the evap system is defective.

SOURCE: 2005 trailblazer check engine light on

Verify any "check engine" by first resetting the computer then waiting to see if it returns. To reset the computer, disconnect the battery cable (some say either cable, I say positive{red} cable). Leave the cable disconnected for about 30 minutes then reconnect it and start the engine. Because the cable was disconnected from power for a while, the computer will have to reboot upon startup. Just like any computer, sometimes a reboot will solve the hangup. If the error returns, it is likely a sensor is bad or the sensor is indicating a true problem.

SOURCE: VSC/ Check Engine Light

My 2000 Lexus GS 400 just had the VSC/VSC off light and the check engine light come on. I would have to push the accelarator peddle all the way down to get it to go. Took it to the Toyota dealer and the code pulled up as the Throttle Position Sensor was out. Purchased one and having it put in. Will update if this fixes the problem.

SOURCE: 2005 mazda 3 2.3l that is burning oil (no leaks)

possibly the pcv but check if your cars exhaust smoke is blueish or white in color if it does and your car doesnt have an oil leak then sure its burning engine oil along with fuel, the piston rings is defective, since you replaced engine oil the additive that the owner has put with the oil to prevent blowby is gone thats why it starts burning oil.....