How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Genchi Genbutsu Your Own Question
Genchi Genbutsu
Genchi Genbutsu, Toyota Master Technician
Category: Toyota
Satisfied Customers: 4395
Experience:  Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine
Type Your Toyota Question Here...
Genchi Genbutsu is online now
A new question is answered every 9 seconds

I have 2006 tundra 4.7 liter with new maf sensor new cats

Customer Question

I have 2006 tundra 4.7 liter with new maf sensor new cats and new o2 sensors and still getting p430 and p420 codes
Submitted: 1 year ago.
Category: Toyota
Expert:  Genchi Genbutsu replied 1 year ago.

Thank you for allowing me to help you with this concern today and am sorry to hear that this is happening. I will have to ask you a few questions so that I can get a better understanding as to what may be going on with your Tundra.

What brand Oxygen sensors and Catalytic converters did you install?

Customer: replied 1 year ago.
Denso sensors
Magnaflow converters
Expert:  Genchi Genbutsu replied 1 year ago.

The Denso sensors, did you install just the post ones, just the pre-cat ones or all 4?

How long ago (miles) were the Magnaflow converters installed?

Customer: replied 1 year ago.
Converters in 1 month ago and post sensors 2 weeks ago
Expert:  Genchi Genbutsu replied 1 year ago.

The problem you have will come down to just the catalytic converters installed and not the sensors. Did you price both the OEM Toyota ones and the Magnaflow? What was the price difference?

Customer: replied 1 year ago.
Hundreds of dollars difference
Customer: replied 1 year ago.
Almostt 1,000
Expert:  Genchi Genbutsu replied 1 year ago.

Yes, the price difference was because of the PPRG content that was put into the catalytic converter construction. Here are just a few links to this information (just in case you didn't already know)...

Catalytic Converters - Explained



These converters are also recycled after they have "gone bad" and sell for $100 each. They are melted down for their precious metal content.

Does this make sense?

Also, did you install them yourself or did you have a repair shop do it for you?

Customer: replied 1 year ago.
I had a shop install them
Expert:  Genchi Genbutsu replied 1 year ago.

I am assuming that they came with a warranty so I would suggest that you revisit them and let them know about this. I would like to forewarn you that they may say something to the effect of "there is something else wrong with your Tundra" but I can for about 99.9% sure tell you that your Tundra is fine except for these less expensive converters.

As a common solution, you may offer to pay the difference between the more expensive converters and let them refund what you have already paid into this repair. This will depend on the shop and your finances.

I have seen this scenario countless times in my career at the Dealer so you are not the first person to have this happen. It's good that it happened so close to the repair because we see most of them last about 10,000 miles or just out of the warranty range with no recourse for the consumer.

Expert:  Genchi Genbutsu replied 1 year ago.

Please take the time to rate my help (1-5 stars) and know that I strive to give Excellent service. I am here to help as much as is needed.