I am getting codes p0101 & l0440 and I need to know how to fix them

 

1. you should list year make model, 2 wheel drive or 4 wheel drive and engine size

2. the search featue on this forum works wonders

3. welcome to the forum

4. try these links

https://blazerforum.com/forum/showth...ghlight=po101\

https://blazerforum.com/forum/showth...ighlight=p0440

 

P0101 The Mass Airflow Sensor (MAF) measures the amount of air entering the engine and the Engine Control Module (ECM) uses the information to determine the proper amount of fuel quantity and ignition timing. The P0101 trouble code is set when the ECM detects a problem in the electrical circuit to the MAF Sensor.

P0440
This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
I had a P0440 code almost drove me crazy for over a year
changed the fuel filter and it went away

 

More to the point:
P0101 Explained

P0440 Explained

 

Thanks riddle
hey stop and have A Whataburger for me
I went ho High School at South West in Ft. Worth
and did some serious 4 wheelin in Johnson Co.