Sensor/Transmission question Accent 2001

I have a Hyundai Accent 2001 with the "check engine" light on,
Yesterday I brought it to a local Garage for a oil change and
to have the engine codes scanned.

Come to find out I need a Oxgyn and Transmission sensor,
I also find out that the Transmission fluid is very dark.

The car has about 124,000 miles and the engine is great,
this morning a mechanic I know said changing the tranny oil may just
pose problems, I shoulld leave it as is and keep full?

I bought this car at 100,000 and have not changed the
tranny fluid, so I am not sure what to think here.

The Garage wants 400.00 to put the sensors in and
friend/mechanic said sometimes the
the code readings can be off, it may be one sensor
wreaking havoc?

I am just wondering what to do here?

Thanks

Kevin

 

There's no way a transmission sensor issue would set an oxygen sensor cod
or vice versa. Of course, having fault codes for the signals from thes
sensors doesn't necessarily mean the sensors themselves are bad. Fo
example, in many cases on the Accent, an oxygen sensor code may occur du
to an exhaust leak or a problem in the ECM programming. On the othe
hand, a code for a transmission sensor is nearly always caused by th
sensor itself. If you post the codes, I can give you the common problem
to check for.

As for the transmission fluid, the recommended maintenance interval i
105,000 miles, so I'm not overly concerned that you'll create a problem.
Also, being dark doesn't necessarily indicate the fluid needs to b
changed, either. The SPIII fluid that's required for your transmissio
often turns dark rather quickly, a normal occurrence. As long as it'
still somewhat transparent and doesn't smell burnt-- it'll often have
characteristic fruity odor--
there's nothing about the condition of the fluid that suggests it needs t
be changed. If you do have the shop change the fluid (which may b
necessary anyway, depending on which sensor they're replacing), mak
absolutely certain they use SPIII fluid. Using the incorrect fluid ca
damage the transmission.

 

I went to Advance Auto Parts today
this is the scan results:

Global ODBll

DTC ( Codes)

PO442
EVAP Emission
Control System Leak (Small)

PO133
O2 Sensor
CKT Slow response
(Bank 1 Sensor 1)

P1529
Manf Cntrl Veh. Spd.
Idle Speed Control
Auxiliary Outputs

PO717
Input/Turbine Speed
Sensor A
Circuit No Signal

DTC Pending (Codes)

No Faults detected
----------------------


Thanks for your help,

Kevin

or vice versa. Of course, having fault codes for the signals from thes
sensors doesn't necessarily mean the sensors themselves are bad. Fo
example, in many cases on the Accent, an oxygen sensor code may occur du
to an exhaust leak or a problem in the ECM programming. On the othe
hand, a code for a transmission sensor is nearly always caused by th
sensor itself. If you post the codes, I can give you the common problem
to check for.

105,000 miles, so I'm not overly concerned that you'll create a problem.
Also, being dark doesn't necessarily indicate the fluid needs to b
changed, either. The SPIII fluid that's required for your transmissio
often turns dark rather quickly, a normal occurrence. As long as it'
still somewhat transparent and doesn't smell burnt-- it'll often have
characteristic fruity odor--

be changed. If you do have the shop change the fluid (which may b
necessary anyway, depending on which sensor they're replacing), mak
absolutely certain they use SPIII fluid. Using the incorrect fluid ca
damage the transmission.

 

P0442: The good news-- this could be caused by an improperly sealed ga
cap. Clear it and see if it comes back. The bad news-- if there's a
actual problem, it's likely to require significant diagnosis by a
experienced driveability technician, not just anybody with a scanner.

P0133: Usually caused by a leaking flex pipe. Check for leaks in th
front exhaust pipe and manifold, especially in the flex pipe area, wit
the engine running. Even a small leak can cause this code to set. I
you're able to rule out an exhaust leak, then go ahead and replace th
front oxygen sensor.

P1529: Indicates TCM requested check engine lamp. See P0717.

P0717: Almost always the pulse generators (input/output speed senso
bundled together). Check the wiring on the sensors to be sure it hasn'
been cut-- have seen this a few times. Otherwise, replace the puls
generators and verify good contact in the connector.

None of these faults indicates any sort of major problem. And although i
may be a good idea to change your transmission fluid (don't know), tha
will have nothing to do with the P0717

 

Thanks a million for your help;
I saw the check engine light few weeks ago and from previous experience
thought maybe the gas cap might be the problem.
My gas cap was missing, I went to a parts store bought a new one
and the light did not go off.

I decided to go to the garage were I usually have repairs done
for a oil change plus a scan of these codes.

The mechanic after scanning said there were two
problems:

Oxygen sensor and a transmission sensor, the transmission sensor
from what I understood could only be accessed by removing
the pan, is this what you see by these codes?

What does "TCM requested check engine lamp."
mean?

Also is the pulse generators located in the transmission?

"replace the pulsegenerators and verify good contact in the connector."

Thanks

Kevin

experienced driveability technician,

front exhaust pipe and manifold,

the engine running. Even a small leak can cause this code to set.

you're able to rule out an exhaust leak, then go ahead and replace th
front oxygen sensor.

been cut-- have seen this a few times.

generators and verify good contact in the connector.

may be a good idea to change your transmission fluid (don't know),

will have nothing to do with the P0717

-

 

The pan does not need to be removed to access the transmission senso
(pulse generators). One bolts into the cover on the end of th
transmission and the other bolts onto the top of the transmission.
Negligible fluid will come out (several drops) when the sensor is remove
from the end cover.

Your vehicle has one computer for the transmission (TCM) and another fo
the engine (ECM). When the TCM sees a problem it deems worthy of alert
it will send a signal to the ECM to turn on the check engine lamp. A
that time, the lamp is turned on and the code P1529 is stored

 

Thanks,

What would be a good manual to get for this car,
also is it difficult to change these thransmission sensors?


Again Thanks

Kevin

transmission and the other bolts onto the top

Negligible fluid will come out (several drops) when the sensor is remove

the engine (ECM). When the TCM sees a problem it deems worthy

it will send a signal to the ECM to turn on the check engine lamp.

that time, the lamp is turned on and the code P1529 is stored
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You have free factory manuals available to you on the internet. Go t
www.hmaservice.com and register for a free account.

The pulse generators aren't hard to change as long as you have the righ
tools (ratchet, long extension, 10mm socket (swivel preferred)).