I went through Echeck & failed the following codes came up on 2004 Cadillac Seville SLS

po171-po174-po300-po410-po741 & check engine light does not work.I bought another PCM.

by in Stow, OH on February 06, 2013
1 answer 2 comments
ANSWER by , February 06, 2013
you have lean codes of 171 and 174 both banks misfire codes po300,emisssion issues with air injection po410 and trans codes po741
COMMENT by , February 06, 2013
How do trouble shoot the problems
COMMENT by , February 06, 2013
this may be beyond your capabilities,sorry not trying to be harsh. i rec you seek the help of your mech to diag every issue.alot of people get some info and just start replacing parts that are not needed,so to prevent wasting $ get proper diag