Question about Honda Accord

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I have two code reading 420 and O2 sensor bank 1

Their are three fuses under the hood that don't have power one of this is 7.5 which light up the check engine light, which is not coming on, and the other two are 10 and 20 next to it. so is their a relay which run this fues

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P0420 is a cat inefficiency code. Most likely the catalytic converter is no longer doing its job. Many times the catalytic conver is replaced in order to resolve this issue.

Cats are covered by a federal emissions warranty. typically 8 years or 80k miles.

You didn't post a year, model or engine size so thats about all the info I can give at this time.

Posted on Jan 16, 2013

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Posted on Jan 02, 2017

  • 14 Answers

SOURCE: Check Engine Light - O2 Sensor - bank 1 running lean

you should have three oxygen sensors on your car, one for each bank of three cylinders; should be towards the Y pipe on each exhaust manifold. Additionally you should have one on the exhaust pipe before the cadilitic converter.

Posted on Nov 20, 2008

juggernautxt
  • 145 Answers

SOURCE: Code: P0133 - O2 Sensor Circuit Slow Response Bank 1 Sensor 1

is this a 4 or 6 cylinder?
if a 4 cylinder it will only have 2 o2 sensors
V6 will have 4 o2 senors which the sensor will be the right side of the engine first sensor.
1st sensor on exhaust, I recommend if you change one change all, as this will make the computer when it rechecks the system you have all clean/fast responding sensors.

if you have a slow response it means the sensor is dirty and not reading well, which is usually caused by minor misfires that the engine computer dismisses, so a tune up would be recommended too.

Posted on May 06, 2009

Lloyd Six
  • 560 Answers

SOURCE: OBD II code P0133 (O2 bank 1 sensor 1) which

It is the front sensor, if your car is the type that has 2 front sensors it will be the one closest to the timing chain / belt (left hand side of engine)

Posted on Nov 27, 2009

ZJLimited
  • 17970 Answers

SOURCE: check engine light on my 2003 sienna, DTC was


Oxygen Sensor Connector locations

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  1. Disconnect the oxygen sensor connector.
  2. Using an ohmmeter, measure the resistance between the terminals +B and HT. Resistance specification: 11 - 16 ohms at 20°C (68°F).
  3. If the resistance is not as specified, replace the sensor.
  4. Reconnect the oxygen sensor connector.

Oxygen Sensor testing

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I really hope helped with this. Remember rated this help, good luck.

Posted on Nov 30, 2009

CaptainKeyz
  • 202 Answers

SOURCE: have this code PO171, what does this mean.

Not sure that the O2 sensor was bad. It sounds like it was telling you that side of the exhaust system was picking up a lean mixure at the O2 sensor. The O2 sensor was doing its job by telling you the mixture changed. If the O2 sensor was bad, it would say low voltage range for that sensor, or open curcuit.
Now the car has had time to do its diagnostic sweep, it is telling you the same thing, but from a different sensor...the fuel mix is too lean. Air/spark/and fuel is what you need in the correct amounts. In your car, the ECM engine control module controls this by taking readings from all the sensors several hundred times a second.
Mechanically, you have a few options. Change the fuel filter...under the car on the passenger side. It is an easy job.
Change the fuel pressure regulator. This keeps the fuel at 4 BAR so the fuel injectors can do their job correctly. This job just needs a screw driver to pop off the clip that holds it in place. No hoses need to be removed. It is on top of the intake manifold, in-line with a metal fuel line and a rubber one.
The fuel injectors could be clogged up on one side of the engine. Run some fuel injector cleaner through a tank of gas. Also, listen for a constant ticking sound at each injector. If one sounds off PAR, then replace it.
The fuel pump may not be giving you enough power. However, the readings seem to be localized to one side, so I doubt it.
Start with the easiest thing, and see if it works. Also, you will need to get yourself a VAG scan tool. It is the only one with codes in it for all of your VW systems, not just engine codes like the ODB scanners. You can get a nice one for $50 on-line.
Good Luck!

Posted on Feb 24, 2010

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All four codes refer to the heating element circuit ! there is a relay in the under hood fuse box that supplies B+ voltage to the O2 sensor heating elements . I would change that or test the relay , videos on you tube on testing relays .
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