kaya nga engine diagnostics kung wala yon di puro hula na lang. Its stupid for us engineers to put something like a diagnostic computer if were going to guess whats wrong with the engine. Engineering is an exact science.

as for your 02 sensor why replace it. when you have a workshop manual if you know what it is. the code given can be crossed referenced and the possible problems can be ticked off one by one. usually it will say first check blank sensor. this does not mean you replace it. you CHECK and see if there is something wrong with it if not see whats next etc till you get it right.

I cant explain it to people who has not trained you just have to believe me i have managed numerous brands at different casas so you have to trust me since it is i who train technicians after being trained in another country.

It was my specialty for more than 10 years. I wont question your knowledge in being a doctor since you are one. I hope you dont question my experience since its my specialty.

Ill keep quiet now.