Bought this Mazda Miata a little over a year now, The owner did a smog check before he sold it to me. A day after I bought it, the check engine light came on. Two-three months later, I replaced both front and rear o2 sensors with no luck of the check engine light going off.
Now I bought a universal Catalytic converter from AutoZone made by magnaflow,"$280", took it in to get it welded on for $80, The OEM cat converter has an oxygen sensor port in the center of the CAT, This aftermarket ca legal cat converter didn't, so the shop made a custom hold right behind the cat to insert the o2 sensor. Check engine light is still on with the code of p0037, heater O2. Smog shop stated that's wrong cat, so I bought a new California legal Walker Cat. $260. Still same check engine code p0037. I already took the car in to get it diagnosed and shop stated it's the cat converter. Now what? Please any help will be appreciated. Thanks.
