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p0420
1-12 of 13 Results
  1. Problems & Solutions
    Hey guys, Hope everyone is doing well. I have a bit of an issue going on with me vehicle that's driving me nuts, so looking to get some help. Vehicle: Honda Accord - 2012 - V6 Odometer: 167000 km (103769 miles) Getting following codes: P0172: Fuel system too rich P0175: Front bank (bank 2)...
  2. The 7th Generation
    P0420. Comes back roughly every 500 miles after I clear it because the light bugs me. Read quite a bit of other posts about this but couldn't find a definite answer. I understand it's hard to know what actually is causing the code. After checking most things (exhaust leaks, cat temps, o2...
  3. The 7th Generation
    Hi, On the month July this year, check engine light for code 0420 came to my car for the first time. After some detailed diagnosis, I changed the catalyst converter of my car. The very next day the check engine light popped up again and I changed the downstream O2 sensor too. After couple of...
  4. The 7th Generation
    Hi everyone - here's the story: I live in Ontario, Canada and there is a mandatory biannual emission testing. I have a 06 Accord 4-cyl (about 243K km) and for the longest time the check engine light would be on but intermittently it would go off. I know from using an Android app (Torque Pro)...
  5. The 6th Generation
    Hey guys. Recently bought a 98 Accord LX 2.3L 4 cylinder automatic for the girlfriend. 177k miles on the car and about 100k on the engine. The car seemed to be in decent shape, definitely an upgrade from her ol' 95 Geo Prizm squealing rust bucket. Started doing some general tune-up stuff...
  6. The 6th Generation
    Sooo I'm hoping someone can shed some light on my situation. I have a 2000 Honda Accord Coupe, 4cyl manual transmission. I have 208k miles (an oldie but goodie car) I've replaced just about everything on this car and it's still running nicely...aside from the CEL (check engine light)...
  7. The 7th Generation
    Got these two codes driving home from work today. P0141 is downstream oxygen sensor heater circuit malfunction. P0420 is catalyst system efficiency below threshold. A few questions. Does anyone know if the oxygen sensor issue would cause the P0420 fault? I replaced the downstream sensor about...
  8. Problems & Solutions
    I have 2004 accord LX 4 cylinder. Few days back got engine light. Code are in sequence P0171 and P0420. Is problem with MAF sensor, Cat or O2 sensor? I try to diagnosis through my OBD reader. I'm getting some reading for MAF sensor and O2 1x2 sensor. But no reading for O2 1x1.
  9. The 7th Generation
    Hi, I have a 2003 Honda Accord V6 coupe. I've had it for a few months, bought it with 118,XXX miles. My cel came on a few months ago with the codes P2195 Rear A/F Sensor Sensor 1 Bank 1 Signal Stuck Lean, P0420 Catalyst system efficiency below threshold bank 1, and P0430 Catalyst system...
  10. The 6th Generation
    Here's the story: 2002 Accord EX 4-cyl Im driving home from work at around 4:30am and I get a flashing CEL. I wasnt far from home so I limped it back to my driveway. Its stuttering hard at stop/idle and struggles very hard to accelerate up to higher gears. Its bringing up a P0304 code, which...
  11. The 7th Generation
    New to the forum and recently bought an '03 Accord with California Emissions. I live in the EasT Coast. P0420 code pops up so I replaced the o2 sensor with a Denso 234-4363 Oxygen Sensor, which is a California legal o2 sensor. CEL came back on and did some thermo tests on cat, found out it was...
  12. Problems & Solutions
    Hi all, my check engine light came on. I took it to Auto Zone, they hooked up there computer and the code P0420 came up Catalyst System Efficiency Below Threshold (Bank 1). Auto Zone said it was probably the oxygen sensor before the catalytic converter, so I replaced it. 3 days later it's back...
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