I just had my emissions / smog check here in California and the NOx were
really high. Very close to failing.
I suspect a bad cat. I measure the temp of the cat with a fluke infrared
and measured 245C or 473F. The temperature was the same at the front,
middle and back of the cat. The car was running at operating temp, I did
this after I came home from work and the water temp was near 100C
Shouldn't the reading be closer to 426C or 800F?
Ideas? It looks like the original cat , the car has 175,000 miles