What does an oxygen sensor do?

kconforti
5

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

2 out of 2 people think this is helpful.
kconforti
5

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

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
5

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

fordtech57
1,275

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

kconforti
5

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?

fordtech57
1,275

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 64,123 nationwide Accord listings starting at $995.
ZIP:

Search Honda Accord Questions

Honda Accord Experts

#1 lightGear
lightGear
Reputation 1,020
#2 Jonathan Ford
Jonathan Ford
Reputation 870
#3 Tom Demyan
Tom Demyan
Reputation 820
View All

Related Models For Sale

Used Honda Civic"
829 Great Deals out of 55,840 listings starting at $995
Used Toyota Camry"
1,632 Great Deals out of 69,626 listings starting at $1,395
Used Nissan Altima"
1,625 Great Deals out of 78,297 listings starting at $1,495
Used Nissan Maxima"
629 Great Deals out of 19,492 listings starting at $1,499
Used Toyota Corolla"
1,232 Great Deals out of 53,380 listings starting at $995
Used Acura TL"
261 Great Deals out of 6,513 listings starting at $2,250
Used Honda CR-V"
657 Great Deals out of 52,082 listings starting at $1,400
Used Hyundai Sonata"
1,046 Great Deals out of 56,914 listings starting at $1,095
Used BMW 3 Series"
1,169 Great Deals out of 36,406 listings starting at $1,200
Used Toyota Avalon"
302 Great Deals out of 15,150 listings starting at $1,900
Used Acura TSX"
205 Great Deals out of 3,863 listings starting at $3,999
Used Ford Fusion"
1,733 Great Deals out of 68,495 listings starting at $2,399
Used Honda Civic Coupe"
163 Great Deals out of 8,277 listings starting at $5,500
Used Kia Optima"
584 Great Deals out of 39,455 listings starting at $1,900

Used Cars For Sale

2014 Honda Accord EX For Sale
3 Great Deals out of 1,290 listings starting at $19,995
2013 Honda Accord EX For Sale
11 Great Deals out of 246 listings starting at $17,787
2012 Honda Accord EX For Sale
23 Great Deals out of 703 listings starting at $11,477
2011 Honda Accord EX For Sale
21 Great Deals out of 429 listings starting at $11,777