guys..i just change a bad injector..,after finish found code 21..(bad PTU) I change the ptu ,now the code is clear, my problem is the car still with like misfire in the new injector and also is smoking blue , the smok small like gas and also the oil small mix with the gas Can be the injector the problem(the o rings)? please some help!!!! my friend is a mechanic and he said I have to check again the injector and also change the oil because probably is mix with gas alredy before fried the engine if any body have idea why is smoking blue with small gas and the oil too? thanks