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  1. 2016-2022 Pilot
    4 months ago I had a P0159 code and had the bank 2 Oxygen sensor 2 replaced. 2 weeks ago the P4020 code came on and I had the fuel injectors replaced under TSB A20-100 and the dealer also cleaned all the carbon from the intake. Now one week later I have a P2096 and P0420 codes. Does anyone...
  2. California
    My 2008 EX-L started throwing a CEL with a P0420 fault code about a year ago at 215,000 miles. Currently at 235k miles, all original parts in the exhaust/emissions system. Cleared the code with my Actron reader and it came back sporadically about 4 times. Each time it cleared and stayed off for...
  3. 2003-2008 Pilot
    Hello, I’ve been getting a P0420 Emissions Efficiency Below Threshold (Bank 1) (or along those lines) on the OBD2 scanner with a persistent check engine light on. The downstream O2 sensor is throwing sporadic voltages when I measure it with the OBD2 scanner and as far as I know it should be...
  4. 2016-2022 Pilot
    My 2017 Pilot Touring (still not paid off, 76k miles) left me stranded last week when it suddenly refused to drive as I was exiting a drive-thru. A horrible noise was coming from the front and the car was jerking to an abrupt stop. I eventually gave it enough gas to get it moving, but it seemed...
  5. 2003-2008 Pilot
    my 2005 Pilot is throwing this lovely code, did same thing around this time last year and went off until now. at that time it just went off so I didnt do anything. Should I change the o2 sensor in bank 1 or the catalytic converter or both? try cataclean? Is the catalytic converter replacement a...
  6. 2003-2008 Pilot
    2006 Honda pilot EX AWD Approx. 114k miles Short version: About a month ago, replaced all 6 spark plugs and the #2 coil pack after the plug failed and melted the coil pack. After about 100 miles of total driving since then, I got the CEL with P0420 yesterday. I've had this error before...
  7. 2009-2011 Pilot
    Honda Pilot 2009 with 217xxx miles on it. Both P0420 and P0430 codes got shown yesterday. Researched a lot and figured I should buy OBD2 scanner with live data to see the output of downstream O2 sensors. Bank 1 sensor had a perfect flat line around 700-ish mV (don't know why P0420 showed up)...
  8. 2009-2011 Pilot
    I just came across this site and woah I have been missing out. Here the situation we bought a Honda Pilot 2011 from a private seller. Due to lack of experience, we ended up buying a car with the codes erased. Then came the time for NYC inspection and this is when P0420 entered the chat. I...
  9. 2003-2008 Pilot
    Searched all over this forum and others but haven't found anyone with same combination of issues. 2007 Honda Pilot EX-L 4WD with about 145k miles has had P0420 code for a while maybe a year now intermittently. Only seemed to come on right after refueling every few fill-ups, so I replaced gas cap...
  10. 2012-2015 Pilot
    My wife's 2013 Pilot, 115k miles, has been giving me a Check Engine Light (CEL) the last few months and the reader started out with just a P0420 code but then added P0430. The CEL will go away on it's own for no apparent reason, the Econ mode will work and then with no indication of performance...
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