Check the brake fluid...
pontiac g6 check engine light car with wrench
check brake fluid level under hood probaly low
Try changing the pcv valve. Also check for blockage on the tube going to it.
bleed the brakes. check fluid level
If a check engine light is flashing that means an engine cylinder misfire has been detected
yes i advise changing it
It is possible for the check engine light to come on in a Pontiac Transport when using ethanol gasoline because it burns hotter than other gasoline. The check engine light might also come on if the oxygen sensor is bad.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Did you check the vacuum hose or did you refill the brake fluid?
The check engine light has nothing to do with an oil change. The check engine light is reset with a scan tool after repairing the failure that caused it.
Have vehicle scanned to determine the problem
Something is wrong with the emissions system.