So I have change my ignition coils all 6 and sparks and I get this code system too lean bank 1 and 2 plus It says that my ignition coils are still bad and I change the air mass flow sensor and the purge sensor even the speed sensor and I still have the same problem I need help please
2005 Toyota Sienna XLE
16,679 miles
Reset errors with good scanner and check again and see what code shows up first. Check voltage, battery, alternator, also voltage at higher rpms should be same or higher. If both banks then propably additional air comming to the engine, might be also o2 sensor, before cat should move from 0.1 to 0.9v, after cat should be stable at 0,45v. Check grounds (google it) simple stuff. MAF should show around 2grams of air for 2l engine and rise with rpms, double rpms double air. If addition air is coming, then with speed and rpms difference should be smaller, keep it steady for 1min. If you dont find anything might be computer. Did you change muffler maybe for free flow ? I dont have any other ideas.
system too lean bank 1 and 2
measure the fuel pressure
And provide your miles per our posting instructions please.
It has 16679 miles