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OBD P0420
Ran scans, cat seems to be working fine, temps are fine, but front o2 sensor is bad. Thinking of switching them and getting another few scans done, until I can get a new sensor.
HOWEVER. There is oil in the coolant tank and a bit of caking on the radiator cap. Not a lot, but definately a worry. When car is running, no bubbling or boiling. Car isnt over heating.
Previous owner says head gastkets are new.Is there a relation to the o2 sensor?
2003 Toyota Camry SE, 4c, 197k miles, regular upkeep, new fuel pump.
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