420A 2GNT P0171, P0132, P0134 Codes! Help.

[e96eclipse]

ok so i got three different codes on my 98 eclipse non turbo.... i need some help! I have a P0171 (which says System too lean-cylinders 1-4), and a P0132 (which says cylinders 1-4 heated oxygen (front) sensor circuit), and also P0134 (which says cylinder 1-4 heated oxygen (front) sensor no activity detected)..I know my O2 sensor up front needs to be changed but i recently installed a aftermarket upper intake and wanna make sure if i change that sensor its going to fix the prob! All four cylinders are lean? will one sensor make all cylinders lean? Help please....

 

[proteusx301]

If you just installed a intake manifold, I would be checking to make sure that you don't have any intake leaks. If in the event that you have a solid intake system, a bad o2 sensor could cause this problem. Your upstream o2 is feeding realtime data to the PCM on oxygen content in the exhaust. You have a lean bank 1 code, so basically the o2 sensor is reading excess oxygen content in the exhaust. This could also be caused if the engine has a vacuum leak and the PCM is adding fuel to attempt to compensate.

 

[e96eclipse]

ok ill check for a leak on my manifold pretty sure there isnt one but would never hurt to check again thanks