Skip the auto shop - Our mechanics make house calls

Q: Had a P0446 code, now I have a P2405 code

asked by on

I had two codes, po126 and po446 originally. I replaced the thermostat and now only have a p2405 code. I originally thought it was the purge solenoid but now it is saying the leak detection pump. Could this all still be related to a bad purge valve? That would make the leak detection pump run at lower current due to a leak and less pressure. Do you think I should still evaluate the purge valve. I have a vacuum pump coming soon.

My car has 198000 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. The P2405 code i...

Hi, thanks for writing in. The P2405 code is generated by the leak detection system which creates an artificial vacuum in your fuel supply system for a short period of time upon each engine startup sequence. If it is unable to hold a vacuum, such as because of a loose gas cap, this code is set. You don't specify which model of Mazda you own, but, there is a Mazda Technical Service Bulletin (01-043/09) which addresses the failure of the leak detection pump. I recommend checking with your Mazda dealers service manager regarding this TSB for your vehicle. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect your service lights for you, and make or suggest any repairs needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Car key remote is not working

There are two tricks for resetting an alarm without a key fob. When the alarm sounds, lock and unlock the door locks with the key three times in a row. Try both the driver and passenger doors as well as...

Q: Mazda MX5 vs. Mazda RX8

It depends on what you want. RX8's are a screaming car that run around and have these rotor engines that blow up, which they still haven't fixed. But Miatas are known as a lady's car. They can last a long...

Q: AC leak.

The two most common leaks on these vehicles are the A/C condenser in front of the radiator and the A/C compressor leaking from the front seal. Before anything else I would recommend having the system checked for leaks by a...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...