im getting these 2 codes. P1273 & P1284

i use to have test pipes and exhaust. then took off the exhaust and put the stock one back on.. got these codes. resset it and didnt come back for a long time.

i took off the testpipes now and put on stock cats. got these codes again.

sometime they go away on their own. and sometimes they come back..

whats the fix? my car is completly stock right now except i have a moterdyne spacer.

 

maybe the shop that installed my stock cats back in didnt tighten them up and i have a leak?

 

Sounds like A/F sensor is bad.

So others don't have to look up or search P1273 is A/F lean and P1284 is A/F rich.

 

same thing was happening to mine.. would come and go. haven't seen it in like 3 weeks so hopefully it'll stay off

 

i had the annoying p1283. changed the o2 sensor which is on the driver's side headers and it did not go away. change the o2 sensor which is on the driver's side cat and it went away

 

seems like a hit and miss fix

i guess i will try cleaning my maf first. i did change to an amsoil air filter couple months back. hope its not the problem

 

Cleaned the maf and checked for leaks on the intake. Seems like next step is to change the sensors

Damn it!

Can anyone direct me to which sensor to replace?

 

Bump! Which o2 sensor should I replace first? Or should I get a new maf?

 

anyone?