1991 Acura NSX: Trying to Pass Smog
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1991 Acura NSX Long Term Road Test

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1991 Acura NSX: Trying to Pass Smog

October 23, 2012

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(Photo by Ron Montoya)

Our first stop after the NSX failed smog was Acura of Santa Monica. Convenience and the hope for a diagnosis took us there. The dealer took a peek and ultimately recommended that we replace both oxygen sensors. "It could be the catalytic converters too," our advisor added, before we asked him for the keys back.

Exorbitant dealer fees were not in our budget. So we drove the car down to a shop we had used in the past, Autowave, for a second opinion...

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The Autowave guys agreed that the O2 sensors could be compromised. We referenced past service paperwork to confirm that the rear sensor had failed once before. That information, and the fact that it was the lesser of the evils (new cats being the greater), made up our mind. To hedge our bets we had both O2 sensors replaced.

Additional forum research suggested a faulty air intake temperature sensor could be the problem. It was a $20 fix, so we asked them to replace that also. In the end, we just wanted this thing to pass smog. It wasn't cheap, but with new parts installed, we now had more confidence calling the smog shop to schedule a second appointment.

Cost of diagnosis at Acura Santa Monica: $148.66

Cost of one air temp and two oxygen sensors: $610.29

Days out of Service: 3

  • Full Review
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  • Long-Term

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