DId they install the correct O2 sensors ?
I have replaced both of mine in my 05 and never the light come on. I used ones from Carquest auto parts.
196k, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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