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.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: code p0446

Hi there. A P0446 (evaporative emissions system gross leak detected-Toyota defined meaning) sets when there is a fault detected in the evaporative system. The evaporative system is an emissions system responsible for preventing the leakage of fuel vapor into the...

Q: High and fluctuating idle. Tried some re-learn programs with no success.

A high an fluctuating idle is usually cause by a vacuum leak or stuck open EGR valve. Also on this vehicle I have seen the PCV valve broken where a failed attempt to remove it from the valve cover it...

Q: What does the PCV valve and hose look like and where are they located?

Hi there. The PCV valve for this particular model is built into the hose assembly. The hose is a larger hose that connects to the intake plenum and runs to the rear valve cover, you can't miss it as it's...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...