P0300 & P0174 but drives normal

Chuck33079 · 10-09-2014, 04:00 PM

P0174 is Bank 2 Too Lean, right? And the P0300 is the random misfire. Maybe a bad O2 sensor? Switch the sensors and see if the code switches with it?

stealth23 · 10-09-2014, 06:08 PM

Quote:

Originally Posted by SouthArk370Z

My guess is that you have a leak in the intake/exhaust system. Or a bad O2 sensor. See what the O2 sensors are reading and that should help you narrow down where the problem is.

It may help to read the system description and other info in the FSM. Plus there is usually a detailed explanation of what the different DTCs mean. Great resource for the DIYer.

Quote:

Originally Posted by Chuck33079

P0174 is Bank 2 Too Lean, right? And the P0300 is the random misfire. Maybe a bad O2 sensor? Switch the sensors and see if the code switches with it?

Do I check the voltage of the 02 sensor to determine a bad sensor ? and Ill try to switch the 2 sensors and see if the code changes. ill also check the exhaust pipes for any leaks.

stealth23 · 10-09-2014, 06:26 PM

Does a test pipe usually throw an SES light ?

SouthArk370Z · 10-09-2014, 07:08 PM

Quote:

Originally Posted by stealth23

Do I check the voltage of the 02 sensor to determine a bad sensor ? and Ill try to switch the 2 sensors and see if the code changes. ill also check the exhaust pipes for any leaks.

Yes. You'll probably want to look at the long- and short-term trim values, too. I'm sure others can suggest more params to look at.

If what you are using to read/clear DTCs will read the O2 sensors, use that. If it won't, you can find OBD/CAN monitors for $20 to what-ever-you-want-to-spend. If you're going to do you own maint/repair, it's an invaluable tool.

stealth23 · 11-08-2014, 02:42 PM

Quote:

Originally Posted by SouthArk370Z

Yes. You'll probably want to look at the long- and short-term trim values, too. I'm sure others can suggest more params to look at.

If what you are using to read/clear DTCs will read the O2 sensors, use that. If it won't, you can find OBD/CAN monitors for $20 to what-ever-you-want-to-spend. If you're going to do you own maint/repair, it's an invaluable tool.

Sorry, been a bit busy. but i finally got the readings and here is what i found.

Bank 1 sensor 1 -- no reading
Bank 1 sensor 2 -- Reading(working)

Bank 2 sensor 1 -- no reading(this is the one thats failing and showing error)
Bank 2 sensor 2 --reading(working)
I'm not sure which sensor is located where so I can replace or at least inspect them. Can someone help me guide which sensor is on headers and cats or exhaust. Thanks

here is bank 2 sensor 1- no reading

and here is bank 2 sensor 2 - reading

and here is the fuel trims

juld0zer · 08-01-2016, 05:27 PM

What was the outcome for this issue?

10-09-2014, 04:00 PM	#1 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	P0174 is Bank 2 Too Lean, right? And the P0300 is the random misfire. Maybe a bad O2 sensor? Switch the sensors and see if the code switches with it? __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

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