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Check Engine Light - OBD2


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datawizard
Novice

Aug 11, 2022, 10:54 PM

Post #1 of 10 (237 views)
Check Engine Light - OBD2 Sign In

I had to replace my O2 sensors on Bank 1-2 and 2-2. Prior to replacing the sensors, the check engine light came on. After replacing the sensors(twice), resetting the codes, and the light continues to come back on after driving about 30 or 40 miles. Strangely, the light appears to come back after I stop for gas and remove the gas cap. So, I replaced the gas cap, and the light once again returned after about 50 miles of driving. This could be just a coincidence, but it seems to be happening.

Any idea on how to solve this issue would be appreciated.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 12, 2022, 1:45 AM

Post #2 of 10 (228 views)
Re: Check Engine Light - OBD2 Sign In

Year, make, model, year and engine size and miles please 1st.
Codes don't tell you to replace parts rather the circuit that is having an issue obviously wasn't those things.

IDK yet a leaking one or more injector, vacuum leaks or anything that can cause a misfire or incomplete burning of fuel will set off O2s,



datawizard
Novice

Aug 12, 2022, 3:49 AM

Post #3 of 10 (212 views)
Re: Check Engine Light - OBD2 Sign In

Tom thanks for the reply. Information noted below:

Vehicle Information: 2013, 2nd Gen Toyota Tundra, 5.7 Flex, Limited, 128k


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 12, 2022, 3:58 AM

Post #4 of 10 (199 views)
Re: Check Engine Light - OBD2 Sign In

What are the exact code numbers being set?

You are replacing downstream sensors. They have absolutely nothing to do with engine performance. They are there for Catalyst monitors only.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 12, 2022, 4:06 AM

Post #5 of 10 (197 views)
Re: Check Engine Light - OBD2 Sign In

This may need a much better code reading and live scan for fuel issues for bank 2 setting off a problem for those sensors to cope with.

"Seems triggered by getting fuel?" you said. Evap emissions may at fault.

This exceeds tossing a few parts already found not the issue so suggest a better diagnosis then decide if you want to do it or not from that.

Lots of reasons to set off plain code for o2 sensors most are NOT the sensors,

T



datawizard
Novice

Aug 12, 2022, 4:09 AM

Post #6 of 10 (194 views)
Re: Check Engine Light - OBD2 Sign In

Hammer, thanks for the response. Generic P0157 is the code, but Bank 1 Sensor 2 and Bank 2 Sensor 2 have already been replaced.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 12, 2022, 4:14 AM

Post #7 of 10 (191 views)
Re: Check Engine Light - OBD2 Sign In

That code is specifically for Bank 2. I would look closely for an exhaust leak forward of that sensor.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



datawizard
Novice

Aug 12, 2022, 4:22 AM

Post #8 of 10 (189 views)
Re: Check Engine Light - OBD2 Sign In

Tom you are correct, and that is where I seem to be going in circles. Lol I have replaced everything that the code could or should be related to, but the light returns.

Additionally, I have also checked the harness with a multimeter and tested the wiring with a voltmeter and they all checked out....


datawizard
Novice

Aug 12, 2022, 4:31 AM

Post #9 of 10 (187 views)
Re: Check Engine Light - OBD2 Sign In

@Hammer, noted. I have looked for any hole's pre-Cat but I have been told that pinhole can cause this code reading. But I have had the exhaust inspected by a muffler shop, who has indicated there are no issues with holes to cause leaking, and the Catalytic converter is fine. Just in case, perhaps I will get a second opinion on this and have it inspected by another muffler shop for a leak.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 12, 2022, 5:48 AM

Post #10 of 10 (171 views)
Re: Check Engine Light - OBD2 Sign In

I'll say it again, This sensor has NO BEARING on engine performance so you are just wasting your time looking at fuel issues.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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