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?
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: Refusal to kick start

Hello. Knowing what kind of repairs have been done would've help a lot with diagnosing this issue. Most of the time this is due to an issue with the distributor failing. The distributor fails internally and causes this. It can...

Q: My car has a little shake to it.

You may have a bad tire or something that is loose on the front end. I would suggest having a mechanic lift and inspect the tires and front end to see if there is a front tire or axle problems....

Q: Oil pressure just started pegging out under acceleration.

The engine oil pressure sending unit has failed and is sending the improper readings to the computer and the computer is displaying the improper results. I recommend replacing the engine oil pressure sending unit. If you need further assistance with...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.