Question about Computers & Internet
HI. You have placed the Auto DTC codes in the wrong position under PC Desktops. With that said; I will provide the definitions to the DTC codes you have posted above and their respective causes and solutions.
P0440- Evaporative Emission System
This indicates that a part of the EVAP control system is no longer functioning correctly. The EVAP system consists of many parts, including 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. EVAP emission canister purge is controlled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented into the environment. A vacuum switch is used to detect when flow exists. If the PCM/ECM commands purge and detects that the switch is closed, The code P0440 is set.
The most likely causes for this code will be a bad vacuum switch, broken EVAP line or canister, Restricted EVAP solenoid or canister, failed purge vale(likely culprit) or a failed PCM. A bad purge vale connector could also cause a misreading, as well. I would advise to reset the code and see if it returns. if so, check all the points above to correct. Replace any failed component that makes up the EVAP assembly.
P0172 - System Too Rich Bank 1
Basically this means that an oxygen sensor in bank 1 detected a rich condition(not enough O2 in the exhaust mix). This code will concern cylinder #1. The necessary actions are to:
Posted on Aug 23, 2010
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Posted on Jan 02, 2017
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