1997 toyota camry check engine light on,code po440,po420,po441,

What this looks like is an EGR valve problem.



Not an expensive part...no special tools required. What this looks like is an EGR valve problem.

Not an expensive part...no special tools required.

Nothing to do with shifting...this is the emissions system.



P0420 means this:



What this means, in a nut shell, is the Three Way Catalytic Converter (TWC) is not working properly.



You have an emissions problem. Nothing to do with shifting...this is the emissions system.

P0420 means this:

What this means, in a nut shell, is the Three Way Catalytic Converter (TWC) is not working properly.

You have an emissions problem.

P0441:



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.

EVAP emission canister purge is contolled 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 to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set. P0441:

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.
EVAP emission canister purge is contolled 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 to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.

A code P0441 could mean one or more of the following has happened:

Bad vacuum switch

Broken or damaged EVAP line or canister

Open in PCM purge command circuit

Open or short in Voltage feed circuit to Purge Solenoid

Faulty purge solenoid

Restriction in EVAP solenoid, line or canister

Corrosion or resistance in purge connector

Bad PCM