P0420 error code on honda pilot - 2008 Honda Pilot

Johnny Brown

• 5763 Answers
• Posted on Oct 02, 2009

SOURCE: radio error Honda Pilot code

the code should be with your owners manualy its on a card the size of a business card.there will be # s on it, make sure you follow directions in manualy on how to enter code,also you might be able to call dealer, give them your cars vin # and they sometimes will give u a code.good luck.

SOURCE: p0420 error code honda odyssey

You don't necessarily need a new converter. I had this code on my 2006 Odyssey at around 150,000 miles for both the front and rear converter and only needed new downstream O2 sensors ($40 for the back, $60 for the front). This is why my car never sees the inside of a dealership shop, they're happy to replace your converter for >$1000 without even looking at the problem. A little troubleshooting goes a long way here. I grabbed an engine code reader from the local auto parts store and read the O2 sensors with the engine running and noticed the voltages on them were erratic, and they shouldn't be. Mine were reading ~ 0.8 volts, then would jump down to < 0.1 volts for a couple readings, then back up to 0.8. The downstream sensor readings should be fairly stable.