I had a purge valve go out and it put 2 codes p0442 & p0 forgot code but it was the purge valve. That code cleared but the 0442 has not. Drove over 200 miles. What can be done to clear it. California. Need it clear for smog.
As you probably know, a P0442 indicates a small evaporative emission system leak. If the leak was fixed, the car should be able to clear the code on its own after a certain number of drive cycles. If the code is in history, it can take as many as 40 to 80 drive cycles which can be a lot more than just driving 200 miles. If the code is current and the MIL light is on, the problem still exists and needs to be fixed. If the code is in history and is not pending or current or listed as permanent, the car should be able to pass a smog inspection. I hope this helps.
@@StuffAboutCars-jg5tx thank you, a drive cycle is when, start car cold, turn on ac,rear defrost other electrical, run for 2 1/2 minutes or 3 minutes? Then drive some city then fwy? But how far?
Actually, a drive cycle is more involved than that. The car will have different requirements for drive cycles depending on the system the car is testing. It usually has to start with the engine temperature below a certain temperature and the car will have to be driven until the temperature rises above a certain temp. The speed of the car has to be kept at a pre-determined speed for a certain amount of time. There are some very specific requirements depending on the system being tested. For example, when the vehicle tests the evaporative system, the fuel tank can't be above 7/8 full or below 1/8 full or it won't do the test. You really have to consult a service manual for the exact requirements to complete a drive cycle for a specific system, however, I find that if all the monitors have been cleared because someone has disconnected the battery or has cleared a DTC (Diagnostic Trouble Code) with a scan tool, if I start the vehicle from cold and drive on the freeway for about 10 to 20 miles and try to hold the vehicle speed constant for as long as I can (don't do a lot of acceleration and deceleration) usually all of the monitors will be set by the time you've finished the drive. That is of course only if there are no problems in the systems that will prevent a monitor from setting. Also, the evaporative system monitor is the hardest one to set and at this time a car will pass a smog test in California if the evap monitor is not set but the rules get a little complicated depending on the year of the vehicle. You may find some useful information that will help you accomplish what you're trying to do on the California Bureau of Automotive Repair web site. Sorry for the long explanation, but the OBD2 stuff gets pretty involved. I hope this helps.
@@StuffAboutCars-jg5tx Thank you, very helpful information. All my DTC are good, of course evap not but it’s ok. I would be smog ready if it wasn’t for stored code 0442. I understand there is the 15/200 BAR rule. The scanners read the warn-up cycle. I’m trying to figure out how to do it for my car. I understand wait till car temperature is under 120 then start and rev to over 166 and it should count as a warm-up cycle. I did at 109 ran till 168 and didn’t work. I did not drive right after but they didn’t say to. I can cool my engine off quickly by putting in garage and turn AC on but I need to know if these are the temperatures or is there something I’m missing.
There's a difference between a Permanent Code and a Stored or History Code. If your P0442 code is a Permanent code, your 15/200 rule would apply (although I've never heard of a 15/200 rule but I'm going to assume it's the 15 drive cycle/200 mile requirement to get rid of Permanent code). If it's a stored or history code, the vehicle should pass a smog check with that type of code in it. If the vehicle is going to clear an evaporative code from History, it can take 40 trips of "no fault detected" to clear the history. The car should pass a smog test if your code is only a History code and not a Permanent code. Another possibility is you can use a scan tool (it sounds like you have one) to clear all the codes. That will get rid of your history code, however, all of your monitors will be cleared also. That means you'll have to drive the vehicle long enough to reset all the monitors and hopefully your evaporative problem is actually fixed and that monitor sets, although you can pass the smog test without setting that monitor, but not if an evaporative problem has been detected and it becomes a Pending or Permanent code. Good luck.
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I had a purge valve go out and it put 2 codes p0442 & p0 forgot code but it was the purge valve. That code cleared but the 0442 has not. Drove over 200 miles. What can be done to clear it. California. Need it clear for smog.
As you probably know, a P0442 indicates a small evaporative emission system leak. If the leak was fixed, the car should be able to clear the code on its own after a certain number of drive cycles. If the code is in history, it can take as many as 40 to 80 drive cycles which can be a lot more than just driving 200 miles. If the code is current and the MIL light is on, the problem still exists and needs to be fixed. If the code is in history and is not pending or current or listed as permanent, the car should be able to pass a smog inspection. I hope this helps.
@@StuffAboutCars-jg5tx thank you, a drive cycle is when, start car cold, turn on ac,rear defrost other electrical, run for 2 1/2 minutes or 3 minutes? Then drive some city then fwy? But how far?
Actually, a drive cycle is more involved than that. The car will have different requirements for drive cycles depending on the system the car is testing. It usually has to start with the engine temperature below a certain temperature and the car will have to be driven until the temperature rises above a certain temp. The speed of the car has to be kept at a pre-determined speed for a certain amount of time. There are some very specific requirements depending on the system being tested. For example, when the vehicle tests the evaporative system, the fuel tank can't be above 7/8 full or below 1/8 full or it won't do the test. You really have to consult a service manual for the exact requirements to complete a drive cycle for a specific system, however, I find that if all the monitors have been cleared because someone has disconnected the battery or has cleared a DTC (Diagnostic Trouble Code) with a scan tool, if I start the vehicle from cold and drive on the freeway for about 10 to 20 miles and try to hold the vehicle speed constant for as long as I can (don't do a lot of acceleration and deceleration) usually all of the monitors will be set by the time you've finished the drive. That is of course only if there are no problems in the systems that will prevent a monitor from setting. Also, the evaporative system monitor is the hardest one to set and at this time a car will pass a smog test in California if the evap monitor is not set but the rules get a little complicated depending on the year of the vehicle. You may find some useful information that will help you accomplish what you're trying to do on the California Bureau of Automotive Repair web site. Sorry for the long explanation, but the OBD2 stuff gets pretty involved. I hope this helps.
@@StuffAboutCars-jg5tx Thank you, very helpful information. All my DTC are good, of course evap not but it’s ok. I would be smog ready if it wasn’t for stored code 0442. I understand there is the 15/200 BAR rule. The scanners read the warn-up cycle. I’m trying to figure out how to do it for my car. I understand wait till car temperature is under 120 then start and rev to over 166 and it should count as a warm-up cycle. I did at 109 ran till 168 and didn’t work. I did not drive right after but they didn’t say to. I can cool my engine off quickly by putting in garage and turn AC on but I need to know if these are the temperatures or is there something I’m missing.
There's a difference between a Permanent Code and a Stored or History Code. If your P0442 code is a Permanent code, your 15/200 rule would apply (although I've never heard of a 15/200 rule but I'm going to assume it's the 15 drive cycle/200 mile requirement to get rid of Permanent code). If it's a stored or history code, the vehicle should pass a smog check with that type of code in it. If the vehicle is going to clear an evaporative code from History, it can take 40 trips of "no fault detected" to clear the history. The car should pass a smog test if your code is only a History code and not a Permanent code. Another possibility is you can use a scan tool (it sounds like you have one) to clear all the codes. That will get rid of your history code, however, all of your monitors will be cleared also. That means you'll have to drive the vehicle long enough to reset all the monitors and hopefully your evaporative problem is actually fixed and that monitor sets, although you can pass the smog test without setting that monitor, but not if an evaporative problem has been detected and it becomes a Pending or Permanent code. Good luck.