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Must be legal in California. My P5 got the dreaded P0421 code. Changing the O2 sensor worked for about a day. Mechanic confirmed that the cat was testing weak. My zip is 92116.

I'm in San Diego. Due to circumstances I was forced to drive my P5 from the west end of Imperial County all the way to Yuma on only 2 cylinders. Come to find out the coil for the 2 inner cylinders was bad. Got it fixed in Yuma. Got it back to SD. Then the check engine light came on again...