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: New starter doesn't crank.

The starter isn't the only portion of the starting system that must be operating properly for your engine to crank. The battery and the rest of the starting circuit must be in operating properly, too. In addition, an engine mechanical...

Q: P1456 - Check engine minor EVAP Leak.. Not the Gas cap

If you smell gas, there can be a leak in a number of places. All the fuel lines should be carefully inspected to make sure they are secure and undamaged, all the way up to the fuel injectors themselves. Even...

Q: Car not accelerating and sputtering

There are many reasons why your car will not accelerate. Is the Check Engine Light on? There could be a faulty sensor that is confusing the computer in your vehicle. When this happens your car will not run correctly. I...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.