What does an oxygen sensor do?

kconforti
25

Asked by kconforti Jun 26, 2013 at 04:22 PM about the 2005 Honda Accord EX

Question type: Maintenance & Repair

I have a 2005 Honda Accord 4 cyl. Started stuttering today while my wife was driving it...kind of shaky on details. Took it to a mechanic and he said that codes were o2 sensor, catalytic converter, and oil pressure switch. Don't have the money to fix it all now. If I was going to prioritize which should I do first?

7 Answers

DavidH25
Not Active

an O2 sensor is in the exhaust stream and measures the amount of oxygen present in the exhaust, sends a signal to the ECU or aka PCM and is part of what information the ECU uses to set fuel/air trim, among other things Here is the oil pressure switch. They are all important, personally I don't know which I would do. If the oil pressure switch, which is a sending unit, completely fails and you will have no oil pressure and not know

4 out of 4 people think this is helpful.
kconforti
25

Thanks Dave. So basically I need to fix all three now?

1 out of 1 people think this is helpful.
DavidH25
Not Active

'fraid so. None are any more important that the other. I know very well about money being tight these days, trust me on that one. You could skip the oil pressure switch, that is the least expensive one (they deleted a picture I had up of one, must have been a copyrighted image) but personally I would want to have mine functioning. Its a sending unit for the gauge but it's also a switch because if you lost all oil pressure it sends a signal to shut you engine off. It could save your engine from being toasted from no oil pressure with $15 part, and almost no labor, unscrew the old one and thread in the new one one, plug wires in, 15 minutes. The catalytic convertor will be the most expensive part...unless you need two or three 02 sensors. You will suffer greatly reduced mpg if you don't do the 02 sensors also. The only other suggestion I have is get a second opinion, if you don't know and trust this mechanic. If you do, them no need for that. Or have the OBD codes scanned for free at any large parts house and see if they agree. No harm in that and no cost either. Good luck kcon

kconforti
25

Thanks for your help David. Think I'm getting a second opinion today.

fordtech57
1,405

kcon i would go with o2 sensor first,the cat reading could have been affected by the o2 readings,if your engine does not seem to rattle i would do oil sender at some other time,hope this helps

1 out of 1 people think this is helpful.
kconforti
25

Thanks Ford. Engine hasn't been rattling -- at least I haven't noticed it the little that I drive it. Its had a bad secondary o2 sensor for a while. Replaced it about 2 - 3 years ago, then about 6 months later the other went bad. Replaced that one, then about 6 months ago it went bad again. Haven't fixed it since. Wodner if that matters?

1 out of 1 people think this is helpful.
fordtech57
1,405

kcon,that shouldnt be a problem,good luck

Your Answer

Add photo

Related Questions

Accord
Looking for a Used Accord in your area?
CarGurus has 61,824 nationwide Accord listings starting at $899.
ZIP:

Search Honda Accord Questions

Honda Accord Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,190
#2 lightGear
lightGear
Reputation 1,150
#3 Jonathan Ford
Jonathan Ford
Reputation 1,080
View All

Related Models For Sale

Used Honda Civic"
1,029 Great Deals out of 60,184 listings starting at $1,200
Used Toyota Camry"
1,666 Great Deals out of 78,421 listings starting at $1,000
Used Nissan Altima"
1,613 Great Deals out of 84,307 listings starting at $551
Used Acura TL"
287 Great Deals out of 5,976 listings starting at $900
Used Nissan Maxima"
478 Great Deals out of 13,517 listings starting at $1,495
Used Toyota Corolla"
1,275 Great Deals out of 52,066 listings starting at $1,000
Used Honda CR-V"
780 Great Deals out of 45,214 listings starting at $999
Used Hyundai Sonata"
1,117 Great Deals out of 64,774 listings starting at $1,550
Used BMW 3 Series"
1,267 Great Deals out of 35,552 listings starting at $1,495
Used Acura TSX"
222 Great Deals out of 3,580 listings starting at $3,105
Used Toyota Avalon"
229 Great Deals out of 16,808 listings starting at $1,500
Used Mazda MAZDA6"
216 Great Deals out of 15,480 listings starting at $2,275
Used Ford Fusion"
1,362 Great Deals out of 64,676 listings starting at $2,495
Used Kia Optima"
723 Great Deals out of 34,060 listings starting at $995

Used Cars For Sale

2015 Honda Accord EX For Sale
2,928 listings starting at $22,800
2014 Honda Accord EX For Sale
13 Great Deals out of 199 listings starting at $18,290
2013 Honda Accord EX For Sale
8 Great Deals out of 393 listings starting at $15,995
2012 Honda Accord EX For Sale
42 Great Deals out of 862 listings starting at $11,603
2011 Honda Accord EX For Sale
163 listings starting at $12,799