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You need to provide the CODES (ie: P0420) since there are dozens of
things we could guess at. What's the mileage, history of the vehicle?

Have you topped up the coolant in the reservoir since the work was done?
That part is in your manual.

'Curly'

Brownie <none@000.com> wrote in news:969331
_a8d6b8548560e317c31431250c0e68fb@autoboardz.com:

Did you disconnect the battery at any recent point? That clears all the
flags.

That suggested "drive cycle" sounds bogus. Removing the gas cap and
allowing the engine to run will set an error code.

The drive cycle in essence ensures that the engine warms up all the way,
and is driven long enough, and under sufficiently varying conditions,
for all the systems to run their self-tests. The monitor flags are set
"ready" after each system passes its self-test.

Take the car for an hour's continuous drive, half highway and half city,
then shut the engine off and allow it to cool completely (at least five
hours). Now repeat your previous hour's driving. This will give you a
much greater chance to have all the flags set.

If the car is never driven very far, or never driven to fully-hot, some
flags will never become "ready".

Now, having said all the above, there are certain vehicles that have
known problems with monitor flags refusing to set. These vehicles are
given exceptional status at smog stations, and so achieve a pass even
with certain flags not ready. Your local dealer can look up any TSBs
that may apply to your car and that problem
(*if* such TSBs exist for your VIN, and they may not).