Slow Pickup

Hello! We have a 99 Sonata V6 ...from a couple of days the pickup has been really slow...on the freeway it drive just fine. I would appreciate any inputs you may have..
Thanks
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The mechanic suggested change of oxygen sensors and catalytic converter and is charging $1300. Does this sound alright?
Thanks
hyundaiuser wrote:

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Wrong guy to ask, but does $1300 sound right?? No.
Bluntly, change the oxygen sensors yourself, and get an evaluation from an exhaust specialist, getting them to do the work if necessary on the catalytic converter.
In my world, $500 should do it, but maybe I'm off.
Tom Wenndt

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This sounds alright only in the event it's correct. I believe there are three catalytic converters on this car. Why does the mechanic want to replace those items? Was the check engine lamp on? If so, what were the trouble codes? Which of the three converters will he be replacing?
My gut instinct says this won't fix your car. Why? Because the oxygen sensor doesn't tend to affect acceleration on this model when it fails. (This doesn't mean it can't do it-- I've seen it happen, but it's very, very rare.) As for the catalytic converter, if it were clogged, it would be likely to be *more* of a problem during freeway driving. When a catalytic converter is clogged, it restricts exhaust flow, making high rpm performace drop, and in more severe cases, makes it impossible to reach high rpm or to even start the engine.
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