I have a Hyundai Accent 2001, the "check engine" started to light a
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.

(This car has 124,000 miles and a great engine)

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

this is the scan results from a scan
at AutoZone Parts Store:

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
----------------------

Wondering what to do here?

 

P0442= this is probably a cracked and leaking rubber hose in the EVAP Emission
system. It's just a matter of finding it.Very common in older cars.

P0133 = this is just a matter of changing the O2 Sensor. Very common.

P1529andP0717 these two are probably internal trans sensors that need to be replaced by a mechanic.

None of these are surprising based on the age of the car.