4 cylinder camry with a p0171 ( system too lean bank 1) code showing. So the fuel filter and the fuel pump is new. I cleaned the mas air flow sensor few months ago but ill do it again as i found out it is the most common problem people have with the p0171 code. The oxygen sensors are all original, havent replaced them. What else could be the problem? Any help? Ill first start with cleaning the maf sensor when i wake up in the morning.
P0171 means your engine is running lean.
Start here for troubleshooting: did you also check for vacuum leaks (smoke test will reveal if you have any - see Scotty's YouTube video on that)?
https://www.samarins.com/diagnose/p0171.html
https://www.obd-codes.com/p0171
Yea ive seen that scottys video about the latest toyota corolla video with the same problem. Im gonna try it with a carbuerator cleaner to see if its the intake manifold gaskets. The catylatic convertor was replaced last year.