1G Error Codes 13, 14, 21, 25

[weig0]

I got 4 error code 13,14,21,25 after i put in the downpipe, testpipe n catback. How can i fix it? anyone have any idea whats wrong? I have a 90 gsx

 

[How Fast Is It]

I got 4 error code 13,14,21,25 after i put in the downpipe, testpipe n catback. How can i fix it? anyone have any idea whats wrong? I have a 90 gsx

My car got the same 4 codes as well. I bought my car w/ a few bolt on mods and it ran great, then one night my cel came on and I got the same 4 codes. After replacing CTS and TPS, I bought a used MAS that was good. But I still get the same 2 codes "air intake temp sensor" and "barometric pressure sensor". Now my car is a bi*** to start!
Any thoughts from anyone?

 

[AlphaAssault]

I bought my car with a hacked up MAS, no honeycomb whatsoever. it ran alright; until one morning where i was driving and i hit something like fuel cut and my CEL came on. took me a week to figure out the MAS was triggering the CEL. i bought a good MAS with 80k miles on it, and she runs like a charm now! I bet its the MAS, imho.