I recently failed my state emissions test. I drive a 91 Toyota Camry with 190k miles. Here are my results
High Speed (25mph)
Pollutant Standard Current Reading Result
HC (ppm) 123
26 Pass CO (%) .69 . 13 Pass CO2 (% ) 14.6 O2 (%) 19.7 NOx (ppm) 878 1093 FailLow Speed (15 mph)
HC (ppm) 128
127 Pass CO (%) ,71 . 31 Pass CO2 (%) 14.4 O2 (%) 20.4 NOx (ppm) 970 947 PassAs you can see from the results, I failed on the NOx and was very close to failing on HC at low speeds. What particularly puzzled me was the high O2 readings. I looked at the results of my tests for the past 5 years and I have never had an O2 reading over 1%. What is going on here? Was it a malfunction of the test??
I should also mention that before taking the test I did all of the usual things to prepare for the test:
- spark plugs have less than 2 k miles on them
- changed oil and filter
- changed air filter
- checked spark plug wires and distributor cap for leaks
- checked egr valve for proper functioning
- checked compression. 170 - 175 psi on all cylinders.
- drove the car for 15 minutes on freeway. Left the car idling before test.
I would appreciate a few thoughts about this problem. Thanks.