Question about 2009 Toyota Yaris

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Change o2 blank 1 sen and still showing coad

Change o2 blank 1 sen and still showing code

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Hello there:
if you replaced it by you're self you may have to drive it for awhile to get the light out it will have to go threw a drive cycle to reset some times it takes a while or you could take to a shop or parts house and find out if they could reset the light for you and if it comes back on there maybe a different problem that will be with in the same system..hope this helps you out please leave a review thanks sincerely D.Jones

Posted on Jun 05, 2010


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My 03 Ecl Spy GT didn't pass CA smog test? OBD II and OBD Bulb check. Ser Fault Codes: P0136- P0141-P0431-P0455.

I'm sorry you replaced the parts without testing first. Codes only give mechanics a suggested area to test, not which components to replace.
Since you replaced the O2 sensor for the first two codes, a mechanic will need to check to see if it is working by reading the data flow from the sensor with a scanner while the engine is warming up. The catalytic converter will also need to be tested to troubleshoot code 431.
Code 455 is for a leak in the evap system which is what vents the gas tank to the vapor canister. The system will need to be pressure checked for leaks and then repaired.
Keep in mind, once the repairs are made and the codes erased, the car will need to be driven at least 100 miles in various conditions before you re-test.

Sep 04, 2015 | 2003 Mitsubishi Eclipse Spyder GT

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I can be driving along and the car just dies, I pull over and wait for about 5 minutes and it will start back up and run like nothing has happened. "Check Engine" light never comes on. I borrowed a code...

02 is not the problem you stated there where cel on when the car died. They could have been pending codes not related to the stall. Common on this car is crank, cam sen. If the crank fails it will stall and not show a crank sen fault code.

May 18, 2014 | 1998 Honda CR-V

4 Answers

03 pontiac montana acts like its out of gas and wont start but sometimes i can work with and it will start. but when running it has very little power. we have tried tune up plugs oil change and fuel...

I assume you have had the fault codes read using an OBD reader as you already mention the o2 sensor?

If so and the error code is showing up for o2 you will need to change the o2 sensor as these symptoms you describe are quite typical of a fault with the o2 sensor.

The oxygen sensor is positioned on top of the manifold and you will need a 22mm socket to remove it or a special o2 socket which is designed to be deep enough to get access to it.

If you want to get access to the sensor from above you will have to remove several components at the top of the engine bay. However it is possible to get at the sensor from underneath with the vehicle jacked up on support stands.

Make sure to replace the sensor with a genuine part and it may be advisable to remove the old one and then check at the parts store to ensure you are replacing like for like with the correct sensor as different states have different emissions laws that effect the actual design used.

Hope it helps. Thanks for using FixYa.

Oct 01, 2011 | 2003 Pontiac Montana

1 Answer

I had the bank 1 sensor 1 ox sen replaced couple days ago. The check light cleared, then today, it came back on. Scan shows the same sensor again. Bad seating or bad o2 sensor?

So what is the code? There is no code that says"replace oxygen sensor" The code sets because the computer isnt getting a reading it expects to get. What kind of car?

Sep 02, 2011 | Mitsubishi Eclipse Spyder Cars & Trucks

1 Answer


Bank 1 should be the drivers side of the engine.Sensor 1 would be the upstream O2 sensor, or the one before the catalytic converter.Replacing it should take care the problem. You will need to clear the code after replacing the O2 sensor.

Dec 27, 2010 | 1995 Chevrolet S-10 CA Edition

1 Answer


po134 o2 sensor no activity bank 1 sen. 1 po130 o2 sensor bank 1 sen1

Jun 14, 2009 | 2004 Chevrolet TrailBlazer

2 Answers

Oxygen Sensors out on Pontiac Grand Am 2003 V6

Your car is equipped with a diagnostic system called OBD II. You can purchase a code reader and use it to find which O2 sensor is causing the problem. You probably have 4 sensors. 2 in front of the converter and 2 behind. The code reader will indicate something like "SEN 1 BANK 1." This means O2 sensor in front of the cat. on the side of the engine that contains cylinder 1. You may see "SEN 2 BANK 1" "SEN 1 BANCK 2" "SEN 2 BANK 2" Bank 2 indicates oppisite side of No.1 cylinder. Hope this helps

Apr 25, 2009 | 2003 Pontiac Grand Am

2 Answers

Check engine light

Sometimes can be prematurely dirty air filter, sets off the air flow sensor, which sets off the o2 sensor. So might try new air filter first and erase codes and then see, before you spend more bucks than you need; then if codes return, do the flow mix sensor.

Apr 19, 2009 | 2006 Honda Civic Hybrid

3 Answers

2001 Toyota corolla hesitates on acceleration

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust).

Mar 27, 2009 | 2001 Toyota Corolla

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