2003 Nissan Altima S - Camshaft & Crankshaft Position Sensors
2003 Nissan Altima S 2.5L W/Automatic Transmission
INTERMITTENT NO-STARTS & ROUGH-STARTS WITH NO DTCs SET.
A LOCAL AUTOSHOP HAD REPLACED ONLY THE CAMSHAFT POSITION SENSOR, MADE SURE
NO DTCs PRESENT AND OPS CHECK GOOD.
HOWEVER, THE PROBLEM RETURNED.
NOW, THE SAME AUTOSHOP BELIEVES THAT THE FAULT IS WITH THE TRANSMISSION
FLEX PLATE, WHICH MAY HAVE DAMAGED THE CRANKSHAFT POSITION SENSOR AS WELL,
ACCORDING TO HIM.
ESTIMATE IS AT ~$750.
The mechanic didn't try to replace the Crankshaft sensor alone, he went
straight for the Tranny drop. I figured go with the cheap fix first. If it
comes back, then we will look into the Flex Plate.
I replaced the recently replaced Camshaft sensor & the never been replaced
Crankshaft sensor. So far, so good.
Replacing the Camshaft sensor is a 2-minute job.
The Crankshaft sensor will likely take 30 times as long.
It seems like the Old Crankshaft Position sensor I removed was a bit high
on a resistance check, when compared to brand new sensors. With too high a
resistance value, the sensor may not make use of the full voltage it is
receiving and/or it may not return the required amount of voltage to the
Powertrain Control Module (PCM), which will lead to irregular engine
operation or a no-start condition.
Both Camshaft & Crankshaft sensors are the same part number. The 3rd
version of the sensor is encased in metal, not plastic.
The OEM part number is 23731-6N21A ($44 us)
The old part numbers were encased in plastic. These part numbers should not
be used: 23731-8J005 & 23731-8J006
FOR ONLINE PART PURCHASE:
"DIGITALDXING" PROVIDED THE LINKS LISTED BELOW AND POSTED SOME PICTURES
(2003 NISSAN ALTIMA 2.5L)
"PAUL" POSTED HIS PICUTRES HERE (2002 NISSAN ALTIMA 2.5L)
"DENTNSHELL" POSTED HIS FIX HERE (2005 NISSAN ALTIMA 2.5L)
"MULEMAN" POSTED A GREAT STEP-BY-STEP WRITE UP WITH PICTURES HERE (2006
NISSAN ALTIMA 2.5L)
Thanks a bunch, muleman.
...ACTUALLY, THAT WHOLE THREAD AT NISSANCLUB.COM IS A GOOD READ.
Best Answer - Chosen by Voters
Nissan recalls that problem to reprogram the ECU. What happens the crank
sensor electrical terminals seep oil into the crank sensors plug. The new
metal crank sensors correct this problem. Location of this sensor on the
back of the motor is difficult to change and you need gorrilia finger grip
to depress the connector green lock and remove the sensor. Depending on
your cars Vin# Recall Campaign # R0712 NHTSA# 07V-527. Hopefully your
factory warranty replaces the sensor no charge 5yr/60,000 mile. The
campaign only covers the ECM reprogram. The ECM reprogram makes both
sensors act as one so either will allow the car to start. Stalling and not
starting is a safety risk.
Nissan Master Technician (John Paul)
For some information on related DTC faults:
2002 Nissan Altima 2.5S Misfire start
This Nissan Altima was sold (used) to me with this problem hidden, and a
few weeks later, it began to get noticeable, and it continued to get worse.
I ended up losing around $7,000 total. I had this car checked by a master
mechanic who works at a local dealership and does excellent work, and noone
had thought this car would give any trouble. After several weeks, we
noticed it eating approximately 1qt / wk of oil, and as well having issues
starting and misfiring (all caused by the same thing). To those of you
thinking of purchasing a Nissan, my advice is don't, and especially not
from Armo Motors. They sold this engine (First gen QR25DE) for 4 years, in
the 2002 - 2006 Nissan Altima 2.5S, the 2002 - 2006 Sentra SE-R, and the
2005 Frontier, and ALL THREE have issues. Nissan has had a few recalls on
them, but still refuses to admit that all those cars had issues. They claim
that although the engine is the same, and shows the same issues, that it is
only truly their fault in a few cases. My particular car had two major
issues that Nissan shoved under the carpet. The first is that the mesh that
holds the catalytic converter material in place can come off, and cat
material can clog the Exhaust, or
worse, get pushed into the engine. The second is that the screws that hold
the butterfly valves in place can come loose and literally get sucked into
the engine. Both of these will cause increased oil consumption, and
(evenually) can lead to a dead engine. After contacting the dealer at Armo
I asked if he could possible help with part of rebuilding the engine, and
he said he had a shop that could do it, and he would pay half. We were
about to get it rebuilt, and when we went to ask for his half, he said
'I've talked to my lawyer, and he says it's best that I don't help you
because it would imply that there was a warranty on the car, which would
give you further grounds to sue' and hung up. I bought a Honda Civic since
then and took the hit; Still waiting from that settlement from Nissan
http://www.youtube.com/watch?v=5r_9qcSQBfc is a continuation of problems I
Why Catalytic Converters Fail - Walker Exhaust Video Series
This video is about catalytic converters and what causes these
sophisticated components to fail.
Any number of problems can damage a converter. And these issues must be
corrected before installing a new one.
There are four primary types of converter failures: poisoning, coated or
oil-fouled substrate, overheated or melted, and structural damage.
Learn more about these four types of failures and the common causes for
these failures by watching this video.
Bottom line, these components don't fail on their own -- an outside issue,
often related to the ignition, fuel system, engine or engine controls, has
caused the failure. And you've got to fix the root cause if you want your
replacement converter to last.
Thirteen Steps for Diagnosing Emissions:
Why Your Altima or Sentra Won't Start & How to Fix it
Amazon sells a spark tester that makes this easier to diagnose
Why Your Altima or Sentra Won't Start & How to Fix it
2003 Altima 2.5S Precat Removal Header Install
Here I show you the dreadful Nissan header/precat and a suitable
replacement header. If you own a 2.5L Altima, Sentra, etc you must make
this fix. This part fails at a very high rate and the end result is always
catastrophic engine failure. To check out the model I bought and seller go
For more info check out
http://www.b15sentra.net/forums/showthread.php?t=135241. I would also
advise that you complete the intake screw fix mentioned on the above
mentioned link. The altima is a beautiful car for a great price, but if you
purchase the 2.5L model be prepared to fix these probems and make sure all
recalls have been completed. My car had 4 recalls including a subframe
replacement. Nissan really had their head up their ass on this one. Cheers.
MC Design Whips 2005 Nissan Altima 'Altimatum' Zenetti Masquerade
This Cool Blue 2005 Nissan 'Altimatum' features a custom two tone paint
scheme with gun metal grey top coat with indigo blue bottom tone. 20"
Custom color matched & chrome Zenetti Masquerade wheels wrap up the running
gear. Shaved rear handles, custom flushed fender inserts, and molded trunk
finish off the custom treats. Visit us today at www.mcdesignwhips.net or
call us at 754 444 2943.
How to replace an O2 Sensor and save money.
I show you how to replace your O2 Sensor. This is being performed on a 1997
Chevy Tahoe. Automotive oxygen sensors, colloquially known as O2 sensors,
make modern electronic fuel injection and emission control possible. They
determine if the air fuel ratio exiting a gas-combustion engine is rich
(with unburnt fuel vapor) or lean (with excess oxygen).
2007-2012 Nissan Altima Cabin Air Filter Replacement
How to replace your cabin air filter in a 2007-2012 Nissan Altima. You'll
need a philips head screw driver for this project. In order to access the
filter you have to remove the glove box. Once removed you can access the
Review: 2005 Nissan Altima SE-R
Go to MYRIDE.COM for more car videos.
Traditionally, Nissan's SE-R nomenclature has been reserved for various
hot-rodded Sentra models dating back to 1991. Starting this September,
speed junkies will be able to purchase a version of the 2005 Nissan Altima
that wears the SE-R badge, offering slight bumps in engine horsepower and torque and
providing yet another reason to skip paying extra for the larger, heavier
Maxima flagship sedan
2013 Nissan Altima vs Maxima 0-60 MPH Mashup Review
( http://www.TFLcar.com ) The brand new 2013 Nissan Altima and the new 2013
Nissan Maxima are two family sedans cut from the same cloth. Of course the
Maxima is Nissan's top of the line sedan while the Nissan Altima slots
right below the Maxima in both price and performance...or at least so we
thought until we tested both cars in another fun and informative TFLcar
Mashup Review. There's of course no doubt that the Maxima is the more
expensive of the two Nissan sedans. It also can be had with the more
powerful V6 but what about size and performance and perhaps more
importantly which car is the better driver. Check out this video comparison
to find out which Nissan sedan is really the top dog.
2013 Ford Fusion vs Nissan Altima 0-60 MPH Mile High Matchup Review
( http://www.TFLcar.com ) The new 2013 Ford Fusion and the new 2013 Nissan
Altima directly compete for the same car buyer. They are both four door
mid-sized family sedans that have gotten bigger for 2013. They both get the
exact same EPA MPG but that is where the similarities end. The Fusion we
tested has a turbo-charged ecoBoost 4 cylinder engine mated to a traditional
6-speed transmission and all-wheel-drive. While the Nissan Altima gets a
bigger 6-cylinder mated to a CVT transmission. In another fun and
informative 0-60 MPH TFLcar review, we compare both cars to see not only
which one is faster but which one
it the better buy.
altima vs mustang gt
MY 2005 altima 3.5 5spd auto vs a 2000 Mustang GT 5 speed manual with bigger
throttle body only. I have a JWT pop charger intake, Magnaflow catback,
Racingline Y pipe, and NWP VIAS delete plate. I was suprised I had almost
3mph on him. Best mph to date is 78.5 with my car.