My 2001 Dodge stratus Coupe 3.0 was originally pulling a P0442 EVAP leak small and now its pulling both p0442 and p1400 MDP sensor. Can these two be related to one issue not both?

Yes it is. Videos in the link

https://www.google.com/search?q=Mazda+MPV+P0442

Code P0442 Mazda: Evaporative Emission Control System ...

https://www.autocodes.com > p0442_mazda
The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause ...

P0442 Mazda: Code Meaning, Causes, Symptoms, & Tech ...

https://www.engine-codes.com > p0442_mazda
The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause ...

P0442: Faulty EVAP System - mazda

https://mechanics.stackexchange.com > questions > p04...
Jul 15, 2014 · 6 answers
The OBD2 code P0442 means that on your system you have a small air/vacuum leak. Apart from the seal on the gas gap, you must check the purge ...

2004 Mazda MPV OBD2 Code P0442 Evaporative Emission ...

https://www.mycarspecs.com > mazda > mpv > base > p...
The P0442 code indicates that there is a small leak in the EVAP system, but this is somewhat misleading. What the code really indicates is that the EVAP system ...

A code P0442 most likely means one or more of the following has happened: A loose or improperly affixed gas cap A non-conforming gas cap (i.e. not factory/original brand) A small leak/hole in a fuel vapor hose/tube Other small leak in EVAP system Faulty vent o-ring seal Defective vent valve Defective purge valve Defective leak detection pump

Read more at: http://www.obd-codes.com/p0442
Copyright OBD-Codes.com

A loose or improperly affixed gas cap A non-conforming gas cap (i.e. not factory/original brand) A small leak/hole in a fuel vapor hose/tube Other small leak in EVAP system Faulty vent o-ring seal Defective vent valve Defective purge valve Defective leak detection pump

Read more at: http://www.obd-codes.com/p0442

CODE PO442 EVAP SYSTEM SMALL LEAK DETECTED A code P0442 most likely means one or more of the following has happened: A loose or improperly affixed gas cap A non-conforming gas cap (i.e. not factory/original brand) A small leak/hole in a fuel vapor hose/tube Other small leak in EVAP system Faulty vent o-ring seal Read more at: http://www.obd-codes.com/p0442 Copyright OBD-Codes.com

The P0442 means Evapotative Emission Control System Leak Detected (small leak), I think you have known where is the problem.

________________________
more car diagnostic tools you can browse

p0708 is transmission range sensor curcuit high output, p0171 is system to lean ( bank 1 ), p0442 is EVAP emission control leak ( small ).

This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. .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.

A code P0442 most likely means one or more of the following has happened:

• A loose or improperly affixed gas cap
• A non-conforming gas cap (i.e. not factory/original brand)
• A small leak/hole in a fuel vapor hose/tube
• Other small leak in EVAP system
• Faulty vent o-ring seal

With a P0442, the most common repair is to:

• Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
• Otherwise, replace the gas cap, or
• Inspect the EVAP system for cuts/holes in tubes/hoses

Few places to check - rubber hose under air box (requires removing the air box) and hoses connecting to EVAP system under the van on the drivers side.

P0700: EATX Controller DTC present
P1684: Battery was desconnected
P0442: EVAP leak monitor medium (.040). Leak detected.
P0455: EVAP leak monitor large. Leak detected.
P0456: EVAP leak monitor small (.020). Leak detected.

I suggest check the lines and flow it down to the ldp (leak detection pump) that is just behind the steering gear under the van It has a wire connector and 2 large EVAP hoses. look for any split or crack then follow the lines back to the tank. Even a small crack is a leak.

Hope helped with this. Remember rated this help. Good luck.

Causes A code P0442 most likely means one or more of the following has happened:

• A loose or improperly affixed gas cap
• A non-conforming gas cap (i.e. not factory/original brand)
• A small leak/hole in a fuel vapor hose/tube
• Other small leak in EVAP system
• Faulty vent o-ring seal

Possible Solutions With a P0442, the most common repair is to:

• Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
• Otherwise, replace the gas cap, or
• Inspect the EVAP system for cuts/holes in tubes/hoses

P0442 is a medium evaporative system leak detected. Check your gas cap and make sure it is on tight and the rubber seal is in good shape. If it was loose, tighten it and the check engine light will exstinguish after a few days on its own. If not this usually means there is a small hose in the system that has developed a small split. It could be several other things as well, it is "usually" a hose. You need to take it to a shop that can proform diagnostics to locate the leak.

Here is a list of possable causes;
POSSIBLE CAUSES
LEAK AT GAS CAP

EVAP PURGE SOLENOID OPERATION

INTERMITTENT LDP MONITOR FAILURE

EVAPORATIVE EMISSION LEAK DETECTION

GAS CAP

LDP COMPONENT LEAK