Yes - ABSOLUTELY C_maina,
Here in the
USA places like AUTOZONE
(personal opinion = yuk) do
FREE readings...
("
FREE" can be pretty costly).
Typically giving them (A-zone) the OPPORTUNITY to sell
new
OXYGEN SENSORS... (the intellectual equivalent
of buying a new
THERMOMETER because you have a fever (the "NEW"
oxy sensors TYPICALLY complain as well as the
old ones...
ERGO...
this is a suggestion I would recommend SKIPPING...
((at least not BEFORE
Sherlock Holmes ... has eliminate EVERY other possibility (like throttle position sensor:
TPS)).
2003 TOYOTA COROLLA 1 8L L4 Throttle Position Sensor TPS RockAuto
Your car is the right age where your trouble could be anything from collapsing
catalytic convertor/muffler, or any over fueling condition...
My very best suggestion... See if you have any EXHAUST shops that perform "
FREE" READS...
Possibly bring those "reads" back here for another
(better ...more detailed) FIXYA answer.
Cross check
their PARTS PRICES with your available sources on the internet (so at least you can negotiate a BETTER PRICE).
USA exhaust $$$...
http://www.rockauto.com/en/catalog/toyota,2003,corolla,1.8l+l4,1432914,exhaust+&+emission
Hope this helps
Carnac the Magnificent