P1131 is a code for an O2 sensor that has pegged lean. It some cases this means you have a bad O2 sensor, but sometimes it could indicate a vacuum leak, an exhaust leak, an injector that isn’t…
P1131 is a code for an O2 sensor that has pegged lean. It some cases this means you have a bad O2 sensor, but sometimes it could indicate a vacuum leak, an exhaust leak, an injector that isn’t…
You must be logged in to post a comment.
){kind=link}
Today we have a check engine light on a Mazda. Let’s see if we can fix it.
https://www.youtube.com/watch?v=IuCYJufwGAA
Cool video, but I think Eric got lucky that the problem was the sensor and
not a wiring issue since there wasn’t really any hard evidence indicating
the problem was the sensor. He kind of just guessed around 6:08. The graph
of the sensor voltage dropping out is inconclusive since a bad sensor and
bad wiring could cause the signal to drop out like that. It just indicates
that there is an intermittent open in the circuit somewhere.
I know Eric has said in other videos that electronics aren’t his strong
suite, but I think, at a minimum, a wiggle test of the wires around the
sensor and tapping on the sensor to (hopefully) force the open to occur
while viewing the graph on the scanner was warranted. That would have been
valid evidence to determine which direction to go in the repair (sensor vs
wires). There is a lot of wire between the sensor and the computer and a
lot of places for an open to occur that would produce this problem. Just
sayin’…
Hi Eric,
I’ve always wondered what if you were to buy a new lambda sensor and fitted
it then find out that it wasn’t the problem…who ends up paying or making
a loss for that part that wasn’t needed?
I bought a 2007 Mazda 3 with a 2.3L engine two years ago. The first summer
I had it, the engine light came on. Code indicated #2 o2 sensor voltage
high. A read with a scanner showed that was in fact an accurate reading.
Light would come on for about 160 miles then shut off for 160 miles then
come back on again. It was like that all summer. Then the light just
mysteriously stayed off. I cleared the codes in time for an emission test
and haven’t had a problem since. Still have no clue what the cause was.
Wasn’t about to buy a new sensor if I could avoid it since on that car it
can be quite expensive.
Great video Eric! Really like that computer you are using.
I dont have to replace an O2 sensor I just love watching your videos to
gain more knowledge! GREAT angle on the O2 sensor replacement! It made it
really easy to see what was going on 🙂 Most people would have the camera
in their hand pointing at the ground while they fix things lol. Keep up the
great work!
A wiggle test watching the 02 , could help check wires . Hope u do more
scanner videos so i can compare. . I did not update my Solus Ultra this
year and not sure if i will next year or not . May just get another brand.
Have u tried the OTC on a pats system, to relearn keys or older gm
throttle relearn. Have seen things done with a Autel that i can not do
with mine or at least we could not figure how to do. Could just be me ,but
not always happy with my snapon scanner.
What happened to the “For those of you who are curious, here’s how many
miles are on the car” :)
cool Eric – love your videos – thx brother – Happy New Year!
Eric, the point where the sensor read zero volts is the point after you
blipped the throttle.
At least in my mind it would be worth mentioning that doing so will
actually cause a fuel mixture overload on any engine as it’s being told it
will need lots of fuel and air but then (as you release the accelerator and
thus close the throttle body) is given way less air.
It’s how aftermarket exhaust systems get their flames at the exhaust tip.
The operator blips the throttle to pump unburnt fuel through the engine and
into the exhaust system. Blipping the throttle again causes the fuel
mixture inside the exhaust to combust and YAY flames.
So yeah, i would expect the O2 sensor to read RICH (0 volts) for quite some
time after you blipped the throttle for that reason. And i would expect the
engine to run lean LONG before the sensor is able to go back to normal
operating conditions.
So in a sense, the engine is running lean because the O2 sensor believes it
is running rich.
Notice how the sensor naturally fluctuates rather than reading a constant
50% value? Well, blipping the throttle like that causes it to go “off the
chart” into the extremes and it thusly takes longer to get back to its
normal range.
Point is, did you blip the throttle in the same manner with the new
sensor…?
I saw something “like it” after the install on your scanner but we never
got to hear the event.
You should have tried to reproduce the same conditions after the swap. On
camera of course.
While i do believe you had a connection issue BEFORE you touched the
connectors i don’t believe the sensor was bad, nor the wiring. It may
simple have been a matter of the connector not being pushed in all the way
for one reason or another and you should have let the vehicle leave the
shop with the message “This would require me to test it for an extended
period of time to see if the problem returns, you could just as well do
that Mr Driver/Owner so please come back right away if the problem comes
back”
Yah… Don’t replace a part unless you have definite proof that it needs
replacing. In this case, the evidence is circumstantial at best.
love the scanner. Is this information and real time data common avaible on
different manufacturers and years or just happen that this masda has it,
but you got this tool in another car and this options are no avaible ?.
Cheer
Good video for a change that The ETCG I LIKE .
Mazda 626 on ETCG! Sahweeeeeeeeeeeeet!
While not affecting the MAF, the torn boot is taking in hot engine air
instead of fresh air from the dam
Eric, I have a 96 Mustang 3.8 and I am getting an O2 lack of switching code
and an O2 circuit no activity code (P0156 and P1151). My scanner shows
absolutely no activity with the OEM or replacement O2 sensor. I am also
getting no activity, just 0.0 volts on the opposite bank.
Is this more likely an electrical issue? If so, where would I start? I
would love to see you put out more electrical videos regarding similar
issues.
Pirate air….sounds cooler than unmetered….
The Encore tester looks like a useful device to have, but at $1875 is above
the means of many of your viewers, myself included. Are there any good,
less expensive testers?
The most annoying fault of all, the intermittant type, grrrrrr lol.
Hello, Eric. What is your thoughts on the Mazda Cars and Vans? How do they
compare to a Toyota or Honda with how well the Mazdas are built. Thanks for
the Videos.
What? Are you telling me that the normal operation of an O2 sensor is
supposed to be a fluctuating reading instead of a steady or nearly steady
reading?????
I wish I saw this video when I had an o2 sensor problem on my ’93 Dodge
Shadow! I couldn’t get that O2 sensor out for the life of me, because I
was using the O2 Sensor socket and it was doing EXACTL:Y what you said. It
was spreading. Fortuantly when I had to change the one on my cobalt, I was
able to get a Box end wrench on it.
My sister had a car just like this, ran great until she got t-boned by a
drunk teenage driver.
Hey Eric, I have a ’97 Subaru Legacy wagon just like the one you had,
except it’s a MANUAL and mostly dog hair free!
Such a great engine in such a crap car.
Would have been interesting to take a look at the long and short-term fuel
trims during the process. How many PIDs can the OTC Encore graph at once?
Another good video,thanks Eric, the old sensor I saw never went higher than
I think about .73v, the new sensor went much higher nearer .93v,another
sign of a failing sensor?
You could just as easily make that O2 sensor socket with a grinder and an
old deep well socket.
Scanner danner would have just licked the wires and had a diagnosis ready
from his onboard pocket picoscope.
I worked in telecommunications for a career and hated electrical problems,
especially intermittent ones. Usually the only way to find the actual
problem was to throw parts at the circuit or wait until the offending part
went totally dead.
I like these kind of videos much more I love troubleshouting like
diagnostiks and repair thank´s erick :D
what is the brown paste thing called?
lol never heard anyone but you call it pirate air!