Welcome Guest [Log In] [Register]
Posted ImageWelcome to the all new Geo Metro Forum. We hope you enjoy your visit.

You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are features you can't use and images you can't see. Registration is simple, fast, and completely free. If you're already a member please log in to your account to access all of our features:

Join our community!




Username:   Password:
Add Reply
HO2 Sensor
Topic Started: Sep 3 2011, 06:28 PM (1,563 Views)
Geo's Apprentice
Member Avatar
GeoThud
[ *  *  * ]
I've had this car for a month. The check engine light has been on all that time. Auto Zone checked it and it gave a PO134 code for heated oxygen sensor bank 1 sensor 1.
The car starts easy and runs fine. It gets 55mpg. That's almost all highway miles at 55 mph and at elevations of 6500 to 8000 feet.
It has no symptoms other than the check engine light.
I hate to fix what ain't broke, so is it really necessary to R&R the sensor?? Might changing it create another problem??
Thanks for your thoughts, advice and this forum,
Tom
:drivin
Offline Profile Quote Post Goto Top
 
iamgeo
Member Avatar
Big League

I assume they cleared the code. Has the C.E.L. come back on?
Offline Profile Quote Post Goto Top
 
Geo's Apprentice
Member Avatar
GeoThud
[ *  *  * ]
The check engine light is still on. I don't know if he cleared the codes or not.
He appeared to this casual observer, to know what he was doing, but who knows?
Tom
Offline Profile Quote Post Goto Top
 
allmountain40
Member Avatar


You are correct in assuming that the oxygen sensor code could be a symptom, not the problem. That said, there is only one way to find out. Also as far as is it necessary, there is something out of whack in your engine management system. If you are averaging 55mpg now, think of what mileage you COULD get with a fully functional engine management system. :thumb
Offline Profile Quote Post Goto Top
 
Norby
Member Avatar


Keep an eye on your mileage for every tankful. As long as it's great/good, don't mess with it. Unless it's going to fail you for an inspection. In that case, you can get a Denso 2344209 for $29.50 plus shipping on Amazon.com.
Offline Profile Quote Post Goto Top
 
Geo's Apprentice
Member Avatar
GeoThud
[ *  *  * ]
We don't have emission testing here. I think I'll buy one and keep it on hand for when I run out of things to do---maybe in a few years!
Thanks for your thoughts,
Tom
Offline Profile Quote Post Goto Top
 
Shinrin
Member Avatar


All it is to change it out is turning it with a wrench, unplugging the wire, and putting the new one back in. If I'm not missing something, it's a 2 minute job unless it's frozen up and can't be turned.
Offline Profile Quote Post Goto Top
 
Woodie
Member Avatar


That code is for a sluggish sensor, and without good, quick feedback the PCM can't control the air/fuel mix properly. You might be wasting gas, you might be poisoning your catalytic converter. I've heard of people cleaning them with a torch to get rid of this code. I'd just replace it, start oiling it now, so the penetrating oil can work its way in there.
Offline Profile Quote Post Goto Top
 
Geo's Apprentice
Member Avatar
GeoThud
[ *  *  * ]
So far, I've changed oil to synthetic, oil filter, thermostat, tranny oil to Synchromesh, PCV valve, air filter and right side driveaxle. To do: sensor(ordered), cooling system flush, radiator, water pump, hoses and belts and timing belt. Beats heck out of TV.
Thanks for help,
Tom

All of the above is completed. Thank you for the forum; ya'll are too kind!
Tom
:beer
Edited by Geo's Apprentice, Sep 19 2011, 10:29 PM.
Offline Profile Quote Post Goto Top
 
t3ragtop
Member Avatar
Turbo3 and Twincam Tweaker

tomk
Sep 4 2011, 08:27 AM
Beats heck out of TV.
winner, winner, chicken dinner!

you know he's got that right. ^o)
Offline Profile Quote Post Goto Top
 
Bad Bent
Member Avatar
Facetious Educated Donkey

BTW, my car has started and run fine for a long time and I get 56 mpg. BUT the CEL would come on if it idled for more than 2-3 minutes. or if I coasted (engine on or off) for a mile or held a steady speed for more than 3-4 miles. an occasional 5oz of Seafoam in the tank would help. I attributed it to the street/race cam but it was in fact the O2 sensor. I replaced it today and the idle smoothed out. :D

It was $17 for the one-wire Bosch sensor. A Denso sensor would take almost a week and cost 2x as much so I took a chance. Anti-seize worked great and it was easy to remove. Turns out it was broken.
Posted Image
Edited by Bad Bent, Sep 4 2011, 09:57 PM.
Offline Profile Quote Post Goto Top
 
Geo's Apprentice
Member Avatar
GeoThud
[ *  *  * ]
Thanks, Bad Bent. I ordered the Denso suggested by Norby. I'll put it in as soon as it gets here. Parts are piling up around here; I'll be busy for a while.
Thanks all,
Tom
Offline Profile Quote Post Goto Top
 
Geo's Apprentice
Member Avatar
GeoThud
[ *  *  * ]
Installed new sensor without problems. CEL is out. Doesn't seem to run any different but, I feel better.
Thanks for the advice and how-to's,
Tom
Offline Profile Quote Post Goto Top
 
Bad Bent
Member Avatar
Facetious Educated Donkey

Peace of mind. :wub:

You might want to get a OBDII code reader if you plan to keep the car. If not throw it in the sale and up the price $50. :thumb

It is not magic. The parts guy is not a magician. It is simply plugging the unit in under the dash, turn on the ignition but do NOT start the car and press the start button. When it is ready flip through the codes, write them down and then erase them. They are on eBay for $30-$35 and more or less if you want to bid on one. Click for eBay search I have one of the orange ones. There are better of course.

Here is what I use for explaining OBD codes: http://www.obd-codes.com/trouble_codes/
Offline Profile Quote Post Goto Top
 
Geo's Apprentice
Member Avatar
GeoThud
[ *  *  * ]
I did get a code reader from Carquest for $70. I wanted it now! I got it because instructions were to erase the code after repairs and before starting engine. It is magic ---it worked. CEL did not go away until after I started the engine. It went out then and has stayed out.
With all y'all's help I keep on apprenticing!
Thanks,
Tom
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
Go to Next Page
« Previous Topic · Engine Tech & Diagnostics · Next Topic »
Add Reply