1996 Ford Aerostar 3.0 L V-6 Constant check engine light ON Ran codes. Code says vacuum leak on fuel canister. I'd like to change all the vacuum lines. Don't have a good schematic. Haynes manual only went as far as to define the code.

https://garatos.com/p1443-ford-code/

Possible causes
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
What does this mean? Tech notes
The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.
What does this mean? When is the code detected?
Evaporative Emission System (EVAP) control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0455 Mitsubishi Description
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

Read more: http://engine-codes.com/p0455_mitsubishi.html#ixzz3NlVyARyX

Possible causes - Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

When is the code detected? EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors P0455 Buick Description This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
if tightening the cap or replacing the cap does not help take your car to a shop to have it diagnosed as it requires special tools/equipment to test this and get an accurate results to find what needs replacing.

The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car.
A mechanic would perform a smoke test to look for leaks.

code p 0441 refers to evaporative emission (EVAP) system --incorrect flow detected ==== causes --- hose connection/s--- intake leak---EVAP canister purge valve replace the purge valve

An O2 Sensor Code, does not mean the sensor is bad.
You failed for the check light, not the code.
The sensor could be old and worn out,when ever you get a check light,yes, you do retrieve all codes first. Then the code is used to direct you to an area or problem, within the powertrain .
O2 Codes are caused more by vacuum issues or other issues,and the code is set, as a result of trying to correct short term fuel trim,and goes out of range,setting the light/code

ok 1443 means you have a vacuum leak somewhere have to look see if you can find it check for a plugged purged vaccuum valve

1996 ford escort runs fine with full power but check engine light comes on p1443 and i changed gas cap the light still comes on?

first check for fuel pressure to your injectors clean the canister & check you intake cause you need three items to start spark'fuel & air if thats all good then you need to retime the fireing order & make sure your getting spark in all plugs & not just one

if your obd2 scanner fits the connection you have obd2, obd1 connector is way differnt.

your code p1443
Control System
Canister Purge
Valve (Mechanical)
Malfunction
Monitors the fuel vapor
flow between the
engine intake manifold
and the EVAP
canister. The system
failure occurs when a
leak or blockage
between the intake
manifold, the EVAP
canister purge valve
and the EVAP canister
is detected by the
PCM.
l Pinched, blocked or
plugged fuel vapor
tubes/hoses (except
between fuel tank and
EVAP canister)
l Damaged EVAP
canister
l Disconnected, cracked
or cut fuel vapor
tubes/hoses (except
between fuel tank and
EVAP canister)
l Damaged EVAP
canister purge valve
Check for audible vacuum
noise in the engine
compartment or significant
fuel odor in the engine
compartment or near the
EVAP canister.

This link has all the codes you need.
http://rockledge.home.comcast.net/~rockledge/RangerPictureGallery/DTCs.pdf