Q: I have failed smog 2 times this past year (2016) for high NOx at low speeds but passed at higher speeds.

asked by on

But the codes in the ECM read nothing about the catalytic converter, only the vehicle speed sensor (p0500), which I already replaced and code p1447 . What is the possible cause of this? There is a strong odor of fuel vapors coming from the car and the exhaust smells bad. What other problems could cause this? Ive also had code p0600 as well. I cleared the codes and the check engine light has yet to come back on, but when I plug the scanner into the car, it has the p0600 and p1447 code. The check engine light works.

My car has 186500 miles.
My car has an automatic transmission.

Hi there. The issue that you are having is the purge valve on the fuel system is not functioning correctly and needs check and possibly replaced. The code P0600 is referring that the dash is not communicating to the ECM (computer). Check the wiring harness to the computer from the dash and see if anything is loose or damaged. If you need further assistance with your emission, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I have failed smog 2 times this past year (2016) for high NOx at low speeds but passed at higher speeds.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I'm getting P0336 code which is crankshaft sensor A. I have changed it out and car still does not start

Hello - lets check basics first. Do you have spark at the plug now? If not, there is still a fault with the ignition. Get the problem codes whether Check Engine is still on or not. If you have spark,...

Q: spark plug coils

Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly. The insulation develops small fractures that open when heated and close when cooled. When open, they allow shorting of coil windings...

Q: The front tire is making a knocking sound when I accelerate

The noise could be a from a tire that is separated or one of the front axles joints being bad. If you do not feel anything in the steering when the noise is happening, then the noise is most likely...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...