Question about 2004 Honda Accord

2 Answers

2004 honda accord v6: check light comes and then goes off. Mechanic did hand held computer scan. code reads p2240 and he says oxygen sensor needs cleaning. Please advise, Harry.

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 456 Answers

that code means there is a fault at the bank 2 oxygen sensor.
as you stand at the frond of the car and look into the engine bay, the sensor is fitted to the middle of the exhaust manifold nearest to you. disconnect the wires on the plug, and i think it is a 22mm spanner or deep socket to remove it.
there are various proprietary oxygen sensor cleaners on the market, but there is no certainty that this will work. there could be an actual fault with the sensor, or it may be too dirty to clean.

if finances permit, i would recommending changing the sensor as a matter of course.

the ecu fault reading can be reset by removing the battery -ve lead for 30 minutes.
make sure you have the radio code before doing this as you will need to reset this as well.

if you only clean the sensor and the fault reading comes back, then you will have to change the sensor and reset the ecu again.

hope this helps.

Posted on Apr 03, 2011

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Honda Master
  • 5,763 Answers

2004 honda accord with a code p2240, this code means the front air fuel sensor has high voltage, take note that there are two front sensors one on each manifold, the bad one is bank 2 sensor 1. Cleaning will not help this problem, you will need to check the wiring to the sensor and also check the connector to this sensor and if all looks good then just replace the sensor. the diffrence between an air fuel sensor and oxygen sensor is that the air fuel sensor does alot more than an oxygen sensor and costs more, the newwer cars use this air fuel sensor, they both look alike but are wired difrently.the location of this sensor is the front manifold sensor, look behing the radiator and you will see it going into manifold, good day.

Posted on Apr 03, 2011


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Got Honda accord 2000 code po135 replaced 02 sensor and stil show same code

How to Diagnose a P0135 -Heater
Performance Bank 1 Sensor 1 (GM 3.5L)
January 31, 2012 Updated: October 29, 2014 Written by: Abraham Torres-Arredondo Article Id: 371

image_1.gifIf your check engine light is on and you have a diagnostic trouble code P0135 stored in the PCM's memory... then you've come to the right place to test and troubleshoot the upstream oxygen sensor.
A P0135 DTC says: HO2S Heater Performance Bank 1 Sensor 1... and this means that the PCM (Powertrain Control Module = Fuel Injection Computer) has detected a problem with the front oxygen sensor's heater element or a problem in the heater's circuit (wires).
In this tutorial, I'll show you how to check the oxygen (O2) sensor's heater element and the two circuits that feed it with power (10 to 12 Volts) and ground with a multimeter.
In case you're wondering, where the oxygen (O2) sensor that the code P0135 is accusing of being BAD is... this bad boy is located on the exhaust manifold and before the catalytic converter.
To help you navigate this article, here are its main points:
  1. Symptoms of a BAD Oxygen Sensor Heater Element.
  2. What Tools Do I Need to Test Code P0135?
  3. What Does the Heater Inside the Oxygen Sensor Do?
  4. Circuit Descriptions of the Downstream Oxygen Sensor.
  5. Start Here.
  6. TEST 1: Oxygen Sensor Bank 1 Sensor 1 Test.
  7. TEST 2: Checking 12 Volts to O2 Heater.
  8. TEST 3: Checking the O2 Heater's Ground Circuit.
  9. TEST 4: Ohming the O2 Heater Element.
  10. P0135 O2 Sensor Heater Test Summary.
Buying a Digital Multimeter for Automotive Diagnostic Testing (found at:
  • Scan Tool.
    1. Don't have one?... check out my recommendation: Abe's Scan Tool Recommendation.
  • Wire Piercing Probe.
    1. Although this tool is not an absolute must, if you do buy one, you'll realize just how easy it makes testing the voltages inside the wires.
    2. If you need to see what this tool looks like, you can see it here:Wire Piercing Probe.
  • < Prev
  • 1
  • 2
  • 3
  • 4
  • Next >

  • Applies To:
    back-25.png forward-25.png
    Buick Vehicles:
    • Rainier 4.2L
      • 2004, 2005
    Chevrolet Vehicles:
    • Colorado 3.5L
      • 2004, 2005
    • Trailblazer
      • 2004, 2005
    3.5L image_thumb_home_page_1.jpg
    How To Test for a Blown Head Gasket (GM 3.5L, 4.2L)
    How to Test the MAF Sensor and Codes: P0100, P0101, P0102, P0103
    How To Test for a Blown Head Gasket (GM 3.5L -FWD)
    All Articles: 3.5L "A day without sunshine is like, you know, night"
    Steve Martin

    Feb 03, 2015 | 2000 Honda Accord

    1 Answer

    How to get the engine codes on a 1997 Honda accord?

    Easiest thing is to go to Autozone as they have a hand held scanner that they'll pull codes for FREE!!! Yep, it's a great service. The most common type of codes are for catalytic converter (low flow catalyst) or even more commonly the oxygen sensor.

    For this car the OBD plug may be behind the ashtray. This will need to be pulled out to access the plug.

    Some times even just clearing the code will be helpful. When the scanner is connected, ask the Autozone tech to clear the codes for you. See if it comes back. Some times the computers get a little tempermental and flip on a light and they don't come back on. It's worth a shot. If it comes back on then you may need a repair.
    Also, has your engine been maintained, ie-tuneups? Poor plaugs SOMETIMES MAY cause the check engine light to come on.

    Nov 30, 2011 | 1997 Honda Accord

    1 Answer

    2004 honda accord EX V6 102K. Missing at take off and malfunction indicator light on 4 days after mechanic changed timing belt, water pump, serpentine belt. Car ran great - never a problem prior to this...

    your crank sensor could be going bad, it could have a bad connection or damaged harness-the chances that there is an issue with the crank itself is a little too far fetched, unless the mechanic thinks there might be something wrong with the reluctor, which is what provides the crank sensor with a signal-that too is kind of rare. I am just guessing here, but I think it's time for another mechanic-he was just THERE when he did the repairs, and now he wants to repair/replace the crank due to a crans sensor code??? You are right, something smells.

    Mar 21, 2011 | 2004 Honda Accord

    2 Answers

    2005 dodge sprinter van with dtc p2240

    2002 sprinter, code # P2240 = abs steering angle sensor can message implausible, this can be due to a bad steering angle sensor or can bus circuit open. you will need to do some testing and a scan tool would be needed to see sensor readings. take a look at the connector and the wiring,CAN is a controller area network, this is the computer system, the way it communicates.

    Mar 20, 2011 | 2007 Dodge Sprinter

    1 Answer

    I have a 2004 Honda civic that basically drops down to 5 mph after driving it for about an hour. The engine light will come on and then after a couple of hours its fine again to drive. It doesn't...

    The check engine light comes ON,when there is error code stored in the car computer. to get car scanned at diagnosis center to get error codes, At diagnosis center you will receive the error code.As per the error code it will detect the exact faulty part in the car due to which the problem is occurring.For more help :--- at its absolutely free to get car scanned. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

    Aug 28, 2010 | 2004 Honda Accord

    3 Answers

    Check Engine Light Remains on

    you need to have the computer scanned to see what codes are present you can go to autozone they should scan it for free and tell you what codes are there hope this helps please dont forget to rate my solution

    Aug 09, 2010 | 1998 Honda Civic

    1 Answer

    08 Accord v6 tpm light stays on after i replaced a sensor , how do i reset it ?

    Your local parts dealer may have a hand held diagnostic computer that can be connected to your vehicle, and the code can be cleared. Most of the time, they will do this for free.

    Feb 14, 2010 | 2008 Honda Accord

    2 Answers

    Check engene light.I checked all belts fluilds and connecions .I pulled the battery cable.

    Bulldog is correct about the check engine light. Pulling the battery cable won't help at all. And, besides it may reset your radio. Then if it requires a code to turn it on you better have that handy. Here's my guess: Your gas cap is loose or you have a bad oxygen sensor. Your Accord has two or three of those sensors. If you want to know which one is bad, go to an Auto Zone type store and have them read the code. They'll test it for free. They are simple to replace. Probably less that $100

    Jan 07, 2010 | 1995 Honda Accord

    1 Answer

    Check engin light !!!

    You need to have your Honda checked for engine trouble codes. Most parts stores offer this as a free service. They connect a hand held 'scan' tool to your cars diagnostic port (usually under the dash) and scan for codes stored on the cars computer. They can tell you what codes they 'pull' from the computer, what they mean, and offer solutions to the problem. If after that you have further questions, post them here along with the code #'s. Good luck.

    May 29, 2009 | 2004 Honda Accord

    Not finding what you are looking for?
    2004 Honda Accord Logo

    699 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Honda Experts


    Level 3 Expert

    79024 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22326 Answers

    Kevin Daniels

    Level 3 Expert

    1455 Answers

    Are you a Honda Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides