what are some symptoms of a bad O2 sensor? - Honda Civic Forum

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Old 02-15-2004   #1
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what are some symptoms of a bad O2 sensor?

I got a 2001 SI coupe, 5 speed with 120000kms.
Anyways....i think I got a bad oxygen sensor..
The check engine light came up. I checked the engine and the engine is there =)
I got bad fuel milage...Lost about 50-100km on a full tank
When I shift I hear this rattle coming from the engine like the car is going to die out and stall.
The exhaust fumes stinks like its full of gas.

What do you guys think?
O2 sensor?
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Old 02-15-2004   #2
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Only way to really tell is to hook the car up to a reader. It will then tell you exactly what is going on.

Autozone might have a reader you can use to see.
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Old 02-15-2004   #3
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Quote:
Originally posted by rickinthescv
Only way to really tell is to hook the car up to a reader. It will then tell you exactly what is going on.

Autozone might have a reader you can use to see.
If you even get a reading on the computer there's something probably wrong. It shouldn't show anything unless there's an issue. Some symptoms are rough idle, sloppy acceleration and sometimes stalling out at a stop.
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Old 02-15-2004   #4
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Take it from me Boss, i know what it's like to have an 02sensor go bad. The car will have a hard time accelerating, it will stall at lights, and it will smell bad. That's what happened to my car but it wasn't the sensors. It was the wires for me. But in your case, sounds like a sensor gone bad.
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Old 07-19-2007   #5
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Re: what are some symptoms of a bad O2 sensor?

First post here, so Howdy! Just bought a 97 EX that is acting very much like the above-mentioned problems. Occasional miss at red lights. Slightly erratic idling, inconsistent acceleration, exhaust that smells funny So thanks for the assist. I guess I am going to do a pretty thorough tune up soon. Not too bad of a deal since I only spent 12oo bucks on the car. 88k on drivetrain . 180k on chassis

-Rob
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Old 07-20-2007   #6
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Re: what are some symptoms of a bad O2 sensor?

Quote:
Originally Posted by BoSS View Post
I got a 2001 SI coupe, 5 speed with 120000kms.
Anyways....i think I got a bad oxygen sensor..
The check engine light came up. I checked the engine and the engine is there =)
I got bad fuel milage...Lost about 50-100km on a full tank
When I shift I hear this rattle coming from the engine like the car is going to die out and stall.
The exhaust fumes stinks like its full of gas.

What do you guys think?
O2 sensor?
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Old 07-25-2007   #7
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Re: what are some symptoms of a bad O2 sensor?

I am also having problems with my o2 Sensor. Symptoms are rough idle that surges slighty, inconsistent acceleration, and maybe bad gas mileage.
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Old 07-25-2007   #8
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Re: what are some symptoms of a bad O2 sensor?

Wow...my msg from 2004.
Anyways...
I have the same prob as Nameless at this moment.
Been having it for like a 3 months now. Reason being, I know something is up but not throwing CEL, so I dunno...
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Old 07-20-2009   #9
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Re: what are some symptoms of a bad O2 sensor?

I got my emissions test done again, second time within a year, and my car is almost failing.

The mechanic said my car is throwing away way too much un-burned gas.

My mechanic checked my plugs before, and he said there's not enough air in the mixture, he blamed my dirty air filter. I've replaced the filter and I'm still having the issue.

I've lost a lot of mileage, but the acceleration is still pretty good.

I have a check engine light that goes on and off, on and off. When I was able to check it, it was bitching out the exhaust or something. The solution online was to just take my car for a test drive. I never ended up doing it because it didn't really look like a solution to anything, but I'll attempt it once again.

I'm starting to think it's the o2 sensor since I was told it should be replaced every 80km or something. I have about 128,000km's on my 2001 civic now. I really don't know what else it could be.
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Old 07-21-2009   #10
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Re: what are some symptoms of a bad O2 sensor?

could be the cat converter. bad o2 sensor will trigger the check engine light. and even then a bad sensor will not really affect how the car drives. its just slower to react and you may lose a few mpg.
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Old 07-21-2009   #11
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Re: what are some symptoms of a bad O2 sensor?

ODB2 scanner FTW
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