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2004 accord replaced O2 sensor no2 but engine light comes on after a few Kim's should it reset itself or do I need to do something fuel economy is back to good

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

keemo68
  • 1263 Answers

SOURCE: 96 Ford truck engine lIght will not go away.

this is the problem with code readers they bwill tell you the code and sometimes even have a reset feature. However they do not tell you the parameters and don't have an drivability feature so you can not test the ecm and all the sensors or modules while engine is running. diagnostic scan tools are very expensive and hard to use unless you have been trained to do so and PEP BOYs is not what I call real reliable mechanics to begin with. Now I concure with toddG on his reasoning in what might be the potential fault. if your vehicle is running rich or lean your O2 sensor will pick this up on the exaust side, however it is not the sole sensor responsible for the ecm adjusting the fuel air mixture.. you stated that you have switched out several o2 sensors and the fuel pressure regulator, but there is also you mass air flow sensor, your TPS sensor, as well as your map sensor these are worth checking out and just because a faulty sensor is the problem doesn't mean you will get a code each time. the system is built with redundancy in order to keep the vehicle running. in order to get the best possible diagnois take it to a shop where they have a full diagnostic scanner this will have not only OBD1 and OBD2 but cam protocol as well. while the tech is scanning the vehicle he will be able to see how the engine is performing under realtime conditions. please rate this as well as change the rating for toddg because he did offer a valid suggestion

Posted on Oct 02, 2008

  • 30 Answers

SOURCE: How do I reset my 2004 Chevy Tahoe check engine light

just go to a garage or dealer to have your light cleared with a computer

Posted on Apr 12, 2009

  • 1 Answer

SOURCE: 2004 Chevy Blazer O2 Sensor

there are two 02 sensors actually on the engine. bank one is cylinders 1 3 5 bank 2 is 2 4 6. it controls the fuel to air ratio, if the O2 sensor is not working, the engine goes into limp mode, which means it is just putting as much fuel as possible into the cylinder, which will effect your gas mileage.

The O2 sensor may be fine, the pigtails off the 02 sensor go bad, the connection. I had in my car, i change the 02 sensor twice, then I found someone said the pigtails may be bad, so I cut the cars wiring harness pigtail, and the one coming off the 02 sensor, and directly wired it with the original truck 02 sensor, and it worked. all 02 sensors look similar, they screw in the side of the engine, and just have 4 wires coming off of it.

Try your origional one, and just bypassing the original wire connector, what I did was cut it off, skinned the wires, put some heat shrink rap on it, combined the wires together soldered them together, and heated the wire shrink rap, so that way it is water proof. car works perfect now.

Posted on May 04, 2009

canbruce75
  • 1776 Answers

SOURCE: how to replace the o2 sensor in 2004 accord v6

The oxygen sensor should be located where the exhaust starts back from the exhaust manifold.

Posted on Jul 17, 2009

jturcotte
  • 7789 Answers

SOURCE: 1998 gmc Sierra Engine light

Hi, there are a number of trouble codes associated with the O2 sensors. Some indicate a sensor failure and others indicate a different problem. Can you tell me the trouble code you are getting?

Posted on Jan 14, 2011

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I have a 2004 Ford f150 5.4 and I am getting a P0171 code by itself on and off. Whenever check engine light comes on the truck doesn't accelerate steadily but once the light goes off its fine. What co


Code 171 means the O2 sensor is telling the computer the fuel mixture for bank one is too lean. Bank one is the side with cylinder number one. The problem could be the sensor, or something else like an injector that is actually causing the fuel mixture to be lean. The sensor would need to be checked.

Jul 11, 2013 | 2004 Ford F150

1 Answer

Check engine light on after fixes. car runs fine


Most of the time this happens, it is due to a loose fuel cap. The system senses that the tank is not pressurized and send a fault as if th cap is missing. Ensure the cap is on tight and allow for a few days to let the system reset itself. Other that that, most check engine light fault are due to failed or failing components in the Emmissions...these include EGR valves, PVC valve, and O2 sensors. If you are not experiencing less that optimum fuel economy, you may just have a bad seal at the fuel cap. I hope this information helps narrow down the problem.

Feb 11, 2011 | 2003 Saab 9-3

2 Answers

WHAT CAUSED ERROR CODE P2097 ON 2005 CARAVAN? ENGINE LIGHT DID GO OUT.


The code found P2097 is 1/2 O2 sensor rich (downstream- below the catalytic converter). Your previous code is related to the same O2 sensor.

I would recommend replacing the O2 sensor then go from there. If it returns then you will have to start testing the wiring. I would recommend changing the O2 sensor now if you are able to.

It is simple to replace and easy to get to. The trip would be a good chance after the repair to see if it returns with the number of miles you would be driving.



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1. Oxigen Sensoir connector
2. Catalytic Converter
3- Downstream Oxygen Sensor
4. Engine Harness connector.

It can have an effect on engine performance and fuel economy. So the sooner you replace it the better. I dont believe it will leave you stranded on the road anyway by any means so I wouldnt worry about that if you arent able to replace it right away before the trip. If you need more help or have more questions then let me know and I will help you further.

Hope heplp with this (remember rated this post).

Apr 28, 2010 | 2004 Dodge Caravan

2 Answers

I have a Honda Accord 2003, how can i fix a downstraem Oxygen sensor.. does this affect the gas cosumtion performance.. how can i fix this.. Help.!


o2 sensor is very important part to the engine when it come to the fuel economy. o2 sensor send information to the computer (ECU) which compute and calculate ratio of burnt exhaust gases. if the engine is not run properly either is too lean or too rich the o2 sensor will detect it as the car will triger the check engine light. you can drive the vehicle which will not hurt it as long you can tolerated the light however the car will get terrible gas mileage and poor performance as the ECU will try to lean the engine out itself. o2 sensor is fairly cheap to replace and fix. Let assume the car get 30 mpg on the high way, running with check engine light/bad o2 sensor will change the gas mileage to 18-25 mpg. If the car is V6 make sure you replace o2 on both side. good luck!

Nov 23, 2009 | 2003 Honda Accord

3 Answers

Toyota Harrier yr2001. been great so far. engine


the knock sensor should also be checked this can cause the engine light to come on a few minutws after driving begins

Oct 09, 2009 | 2001 Lexus RX 300

1 Answer

Check engine light was on. OBD II scan said both pre-Cat 02 sensors running lean. Also shows P0000 code which is a undefined code. S dash light comes every few days then transmission will stay stuck in 4th...


The pre cat sensors running lean does not mean they need to be replaced. They are are detecting a symptom. You need to know why.

If you are using a basic scantool (code only) you need to look up the P0000 code.
I thought this an odd code. I looked it up in my Autotap unit and it does not exist. The lowest # P (powertrain) code I have listed is P0016.

A regular scan tool, won't scan transmission or body codes, mu Auto tap doesn't either. You need a Tech 2 from the dealer for transmission codes.

First some history. The first O2 sensor was introduced in 1976 on a Volvo. California vehicles got them next in 1980, then federal emission laws made O2 sensors virtually mandatory on all cars and light trucks built since 1981. And now that OBD-II regulations are here (1996 and newer vehicles), most vehicles now have multiple O2 sensors, some as many as four!
The O2 sensor is mounted in the exhaust manifold to monitor how much unburned oxygen is in the exhaust. The signal from the O2 sensor tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen).
A lot of factors affect the richness or leanness of the fuel mixture, including air temperature, engine coolant temperature, barometric pressure, throttle position, air flow and engine load. Other sensors monitor these factors too, but the O2 sensor is the master monitor for what's happening with the fuel mixture. Problems with the O2 sensor can throw the whole system out of whack.
The computer uses the oxygen sensor's input to fine tune the fuel mixture for the best balance of power, economy and emissions. The engineering term for this type of operation is "closed loop" because the computer is using the O2 sensor's input to adjust the fuel mixture. The result is a constant flip-flop back and forth from rich to lean which helps the catalytic converter operate at its best and keeps the average fuel mixture in proper balance to minimize emissions. It's a complicated setup but it works.
If no signal is received from the O2 sensor, like when a cold engine is first started (more on that in a minute) or the 02 sensor fails, the computer orders a steady, rich fuel mixture. This is referred to as "open loop" operation because no input is used from the O2 sensor to fine tune the fuel mixture. If the engine fails to go into closed loop when the O2 sensor reaches operating temperature, or drops out of closed loop because the O2 sensor's signal is lost, the engine will run too rich causing an increase in fuel consumption and emissions. As you might have guessed, that will set a code and turn on your check engine light.
How does it work? The O2 sensor produces a voltage once it gets hot. The sensor compares how much oxygen is in the exhaust to the oxygen in outside air. The greater the difference, the higher the voltage reading.
If you ever replace an O2 sensor (and if you're a DIY'er this is something you will do eventually), its important to remember that the O2 sensor needs to "breath" outside air to work. So don't put any grease on the sensor because it could block this air flow.
An oxygen sensor will typically generate up to about 0.9 volts when the fuel mixture is rich and there is little unburned oxygen left in the exhaust. When the mixture is lean, the sensor's output voltage will drop down to about 0.1 volts. When the air/fuel mixture is balanced or at the equilibrium point of about 14.7 to 1, the sensor will read around 0.45 volts.
When the computer reads a rich signal from the O2 sensor it leans the fuel mixture to reduce the sensor's reading. When the O2 sensor reading goes lean the computer reverses again making the fuel mixture go rich. This constant flip-flopping back and forth of the fuel mixture occurs anywhere from 2 to 7 times a second at 2500 rpm on OBDII vehicles, depending on what type of fuel injection system they have.
The oxygen sensor must be hot (about 600 degrees or higher) before it will start to generate a voltage signal. Many oxygen sensors have a small heating element inside to help them reach operating temperature more quickly.
Ok – that was a lot of info on what they do and how they work. The next thing to know is that trouble codes relating to O2 sensors are very common. But you really need investigate further before replacing an O2 sensor just because you got that trouble code. Armed with the information above on how often the O2 sensor "flips" back and forth and AutoTap or another scantool that allows you to monitor O2 sensor voltage, you can be certain whether the O2 sensor itself is really the problem. These sensors can be pricey, so don't just replace them the first time you see that trouble code!

The O2 sensors are expensive, diagnose what really is going on.

Jul 27, 2009 | 1999 Cadillac Catera

1 Answer

Check engine light comes off and on 2004 Honda Accord, and sometimes lose power and then starts riding fine again; I just had it hooked up to diagnosis and can't find the problem


Sometimes losing power because there is not a correct air/gas mixture. Your car need a close to 14.6:1 ration to be perfect.
This ratio is maitaining by ECU, only if the ECU gets the correct signal from your O2 sensor. The O2 sensor is about 100 bucks. First to take off battery ground cable off your car for 1hour to clear out some error state. When putting back, if the check engine goes off for a while then coming back, replace the O2 sensor. Good luck.

Jul 06, 2009 | 2004 Honda Accord

1 Answer

95 caddlilac seville STS getting horrible fuel economy.


You will see shorter service life of those O2 sensors with that kind of mileage. I would also suspect that the injectors are seriously worn if original. a few things to also look at that tend to throw 02 codes:

1: MAP OR MAS sensors,
2. worn timing chain
3: Restricted air intake (filter, or leak between MAS sensor and Intake)
4: Engine coolant thermostat (if the engine never warms fully, the mixture will be overly rich)

The O2 sensors tend to get wiped out by too much or too little fuel, too much in your case. you have to find the problem of fuel delivery or it will kill any O2 sensors you replace.

Have you performed a compression check? in some cases the piston, or rings have failed and allowed a large amount of fuel to enter the crankcase oil.

Jan 04, 2009 | 1995 Cadillac DeVille

7 Answers

Check Engine Light Comes on Intermittently


The P0141 code points to the O2 sensor heater circuit. It could be that there is a short in the wiring to the O2 sensor or it could be that the O2 sensor heating element itself is bad. The code is for O2 sensor Bank 1 Sensor 2. Bank 1 means its the O2 sensor connected to the exhaust pipe that runs to cylinder #1. Sensor 2 means that it is likely the O2 sensor after the catalytic converter on the same exhaust pipe.

Dec 31, 2008 | 2004 Honda Accord

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