Report "I own a 2005 Scion Xa with 69000 miles Texas state inspections requires that the vehicle pass emission test as part of the inspection It failed inspection because there were 4 trouble codes stored p0441 p0442 p0446 and p0456 but the check engine light never came on The check engine light does not come on when you first turn the key on or when you start the car or while the care is running What is the cause for the trouble codes and why is the check engine light not working"