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Old 01-25-2010, 01:15 PM
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O2 sensor

Quick question..... My 99Lude has been running rich lately and my CEL just came on. i have yet to check exectly what the is causing the CEL to go off, but i will. I want to replace all my O2 sensors on the car does anyone know how many O2 Sensors/Lines i have to replace and where the best/cheapest OEM place for me to get them. Thanks!

Just out of curiousity what other causes is there when one's car is running lean?
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Old 01-25-2010, 01:30 PM
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Re: O2 sensor

Running rich or running lean? Can't be both.

All H22's tend to run rich, just the way Honda set them up.

There are two O2 sensors, one before the cat and one after.

I would suggest you skip the OEM (too expensive) and just go NTK or Denso. Basically the same thing since they supply Honda.

Try: Spark plug, Spark plug wire, spark plug gap, spark plug cross reference and ignition wires at Sparkplugs.com
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Old 01-25-2010, 01:32 PM
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Re: O2 sensor

Change your pcv valve. It can cause your car to run rich. H22 preludes have a tendancy to run rich but replacing your pcv valve can help prevent running rich.

Now, I am confused though. You said it is running rich but then you ask what causes a car to run lean?
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Old 01-25-2010, 02:03 PM
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Re: O2 sensor

Rich or lean?!?!

Either way take out your PCV and shake it to see if it rattles. If it doesn't then replace it. It's cheap.

As for the O2...it's most likely the 2nd bank and not the first which is the O2 after the CAT. replacing it with a Denso or NTk will run you about $50.
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Old 01-25-2010, 03:18 PM
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Re: O2 sensor

Great info everyone! will definitely do all of that. hey is it me or is it similar with everyone? it seems that this car is a gas gusler!!! its probably cus im running lean but this thing is burning my wallet LOL!
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Old 01-25-2010, 03:20 PM
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Re: O2 sensor

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Originally Posted by Viloria9 View Post
Great info everyone! will definitely do all of that. hey is it me or is it similar with everyone? it seems that this car is a gas gusler!!! its probably cus im running lean but this thing is burning my wallet LOL!
There you go saying lean again... Rich or Lean?

I'm guessing rich since you or producing black smoke...

What's your average mpg?

City, highway, or a combo of both?
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Old 01-25-2010, 03:24 PM
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Re: O2 sensor

I meant to say rich. Umm... i havent actually doen the month but i am guessing 17-19/gal. in the city. i am also using 93 octane gas. this thing is like my old 2001 BMW 330ci, and that was a v6.
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Old 01-25-2010, 03:30 PM
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Re: O2 sensor

In the city that isn't surprising really. Automatic or Manual?

Next time you fill up clear your miles and then do the math when you fill up again.
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Old 01-25-2010, 04:03 PM
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Re: O2 sensor

Yea definitely. I have a manual, its the only way to fly! LOL! Ill see what my gas mileage is currently and then what it will be after changing the the 2nd bank O2 sensor and PCV. Hopefully there is a significant change in performance and mileage! Fingers crossed!
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Old 01-25-2010, 05:03 PM
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Re: O2 sensor

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Originally Posted by BB2H22A4 View Post
In the city that isn't surprising really. Automatic or Manual?

Next time you fill up clear your miles and then do the math when you fill up again.
Really? In the city if I get under 23mpg I'm wondering whats wrong with me =/ and MOST of the time if I drive conservatively I can get about 25mpg out of it...

Currently I'm getting 22.9( that was today that I filled up as a matter of fact...) all in town with CEL on for the EGR ports. Highway mileage for me is between 28 and 32(I did 35mpg once, but that was in the mountains of NC TN...)

Anywho, if you have a 5spd just shift before 3k rpms and go real easy on stop and goes. That will really help your mpg whether its an auto or manual...


OH, and quick tip. The night before you decide to change your O2 sensors, when you park the car for the night, spray some pb blaster or liquid wrench on those badboys and let sit over night. And have a cheater bar handy...
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Old 01-25-2010, 06:27 PM
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Re: O2 sensor

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Originally Posted by Lazer View Post
Really? In the city if I get under 23mpg I'm wondering whats wrong with me =/ and MOST of the time if I drive conservatively I can get about 25mpg out of it...

Currently I'm getting 22.9( that was today that I filled up as a matter of fact...) all in town with CEL on for the EGR ports. Highway mileage for me is between 28 and 32(I did 35mpg once, but that was in the mountains of NC TN...)

THE DRAGON!!!!

I was thinking he might have a automatic and might get on it sometimes. I'm with you, at least when I had my black one I averaged about 25 mpg. But that wasn't really city that was a mix of city and highway. I am guessing your 23-25 is more a mix too. When he said city I am thinking dead stop go traffic the whole time, but I could be wrong.
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Old 01-25-2010, 07:59 PM
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Re: O2 sensor

I suggest doing the NGK O2 sensors and PCV valve.
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Old 01-25-2010, 09:52 PM
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Re: O2 sensor

Why exactly would the PCV valve make it run rich?

If it were stuck closed, then pressure could build up in the crank case and damage the engine which is bad, but still shouldn't make it run rich.

If it were stuck open, then that would really only be an issue if you were boosted (greater pressure in intake than crank). In such a case fresh air would go from the intake to the crank instead of the other way around. I guess that would mean less air than expected entering the head, but not much (pretty small hose).

Definitely not good if the PCV valve isn't functioning, I just don't see how it would cause a car to run rich.
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Old 01-25-2010, 11:36 PM
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Re: O2 sensor

^ do you know what it means when your car is running rich? If you did then you would understand why it being stuck open or closed would cause your car to run rich or lean.

Last edited by HardKnoxBB2; 01-26-2010 at 08:10 AM.
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Old 01-26-2010, 12:34 AM
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Re: O2 sensor

Rich = < 14.7:1 air/fuel, so more fuel than the combustion reaction requires. As I understand it the PCV valve is simply there to allow pressure from the crank case to be drawn into the intake and even then at higher RPM's gasses exit via the breather tube anyway.

Only effect I can think of is when the valve is normally closed some air from the intake could go into the crank case instead of being combusted? Should have the opposite effect though. When it is usually closed intake vacuum is at maximum so the result would be extra air entering (intake>breather tube>crankcase>PCV valve>intake), so it would run leaner not richer.

Last edited by rhangman; 01-26-2010 at 04:41 AM.
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Old 01-26-2010, 06:28 AM
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Re: O2 sensor

bad o2 can cause a decrease in milage so it may be part of your problem
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Old 10-05-2010, 01:49 AM
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Re: O2 sensor

I was wondering about the O2 sensor /gas mileage relation too. I recently got a 99 lude 5 spd. and the same day I bought it the CEL came on. Code was "P0420"... funny thing is... when I first went to go check the car out at the dealership, it wasn't at the lot... they said there were replacing the Oxygen sensor... then the same day I buy it, the CEL comes on and throws a code for an oxygen sensor... I came back and they had the car up on the lift, so don't know if they just cleared the code, or installed a bad o2 sensor, or the wrong one or what?

Seems like in this car i get really crappy gas mileage. Used to have a 4th gen lude, 5spd, vtec, and that car actually got pretty good mileage.


curious... could an exhaust LEAK cause this code to be thrown (P0420) rather than the actuall sensor being bad? When I went back to the dealership and they had the car up on the lift...they had a section cut out of exhaust (looked like cat) and the welder was out, so maybe they they just put a whole new cat/sensor in and then didn't weld it up good?

Last edited by HiGhGuY; 10-05-2010 at 01:58 AM.
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