My Check Engine Light is on and the OBD-II reads out as PO141- O2 Sensor
Heater Circuit (Bank 1, Sensor 2). I have a couple of questions about this.
1--- Is the PO141 code a pretty simple and straightforward sensor
replacement or do I need to be cautious about this?
I have read so many Check Engine Light horror stories about dealers racking
customers over the coals by selling them unnecessary, expensive parts or
having to return repeatedly to finally get the right one replaced.
2--- Is this something that I could have reliably done at a local shop
instead of a dealer (at a substantial cost savings)??
I'm just replying so that there's some early input. I havent dealt with
that BUT the system sees a problem with the heater current to that sensor...
ie - is none.
That could mean a broken wire, bad connection or a failed heater element in
the O2 sensor.. this wont adversely affect your car's operation in the
short term, Sensor 1 is the primary mixture control.
As to where to go to have it fixed, good luck. Word of mouth references in
this case are best.
Thanks for your input. I will start asking friends for recommendations for a
Though this particular code will not be bad for the car in the short term, I
will be selling the car soon, so it must be resolved anyway. Your comment
"That could mean a broken wire, bad connection or a failed heater element in
the O2 sensor" is exactly where my fears of dealer-greed come to play.
Thanks again, Lar
I don't have the service manual (and hope to sell the car soon.... so don't
want to buy one).
Are the 02 sensors easy to locate?
How do I differentiate between (acc. to OBDII: Bank 1- Sensors 1 and 2? 2 is
the one I am concerned with.
Bank #1 is always the bank with cylinder #1. It is not a question, it is a
statement of fact. Find cylinder #1 you find bank #1. Do not know what cylinder
#1 is? You ought to be using a manual. Don't want to buy one? Go to the library
Just in case anyone refers to this thread, cylinder #1 (and therefore Bank
1) is on the right
(passenger) side. So, Bank 1, Sensor 2 is the right hand side, rear sensor.
I greatly appreciate the efforts of those that gave helpful answers. Hope to
return the favor sometime.
Bit of a left turn. The dealer and everyone else wants to know if it is
right or left handed. That is supported by the OBDII readout of "Bank 1,
Went under the car to read the actual part number for the dealer and I found
that this 5.0 V-8 dual exhaust is actually only "dual" after the cat! There
is one sensor upstream and one downstream. Just wanted to mention that
finding. The downstream one is hard to get to as it us right above a
Anyway, now I will challenge the dealer's parts dept on the configuration of
the exhaust system in determining the correct replacement sensor.
on most cars with obd2, there is only 1 "2" sensor, I am suprized there is
only 1 "1" sensor on that car though. Are you sure there isnt one on (or
just below) each exhaust manifold. (not that it matters in relation to your
problem cause your "2" is bad) You might try a local auto parts store for
the sensor, the price will probably be better.
So "Bank 1, Sensor 2" and "Bank 2, Sensor 2" are the same sensor in this
case? I am pretty sure about the single upstream sensor but I would be
willing to get under the car again in a few days. What I don't get is why
every parts place I called asked me if #2 is the left or right handed
Yes, it most likely only has 1 "2" (after cat) sensor. Vehicles with dual
exaust will have 2 cats and 4 sensors (1 before each cat, and 1 after each
cat.) They ask you because their computer tells them to. Have them look at
both and I bet you will find its the same part number or they wont stock one
of them because it is rare or doesnt exist :). Either way if the plug fits,
and the length of wire is long enough it will work. I have seen some rare
cases where the wires are in the plug differently but that is easy enough to
see also and IIRC the plug will be slightly different too. I do remember
Ford asking for a "calibration code" for sensors on some cars. Its just a
number on a sticker in the door jamb. They needed that code to look up the
correct sensor. A regular parts house wont ask for that.
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