* Which sensor: The Impala has multiple oxygen sensors (typically one before and one after the catalytic converter). The pre-cat sensor is generally more expensive and harder to access. The location significantly impacts labor costs.
* Part cost: The price of the oxygen sensor itself ranges from $30 to $150+, depending on the brand (OEM, aftermarket, etc.) and quality. OEM sensors are generally more expensive but often considered more reliable.
* Labor cost: Labor costs vary widely by location and shop. A shop's hourly rate can range from $75 to $150 or more. The job itself might take anywhere from 30 minutes to a couple of hours, depending on accessibility.
* Additional repairs: Sometimes, other issues are discovered during the repair process, increasing the total cost.
Therefore, a reasonable estimate would be between $150 and $400. The lower end is likely if you buy an aftermarket sensor and find a shop with lower labor rates, or you do it yourself (if you have the mechanical skills). The higher end reflects OEM parts and higher labor costs in certain areas.
To get a precise cost:
* Call several local mechanics or auto repair shops: Get quotes from at least three different places, specifying that you need an oxygen sensor replacement and ideally stating which sensor (pre-cat or post-cat) needs replacing if you know.
* Check online parts stores: Sites like AutoZone, Advance Auto Parts, or RockAuto can give you an idea of the part cost. Remember to add the labor cost estimate.
Don't be afraid to negotiate, especially if you have multiple quotes. Make sure you understand exactly what's included in the quoted price.
