1997 Nissan Sentra, Car failed emmissions testing because computer was not ready. Check engine was ON due to throttle position sensor. Replaced sensor. I disconnected the battery for 20 seconds and drove the car over 100 miles, connected an OBD scanner but it couldn't read the computer either. What should I do or check for?
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Re: Computer "not ready" for emmissions testing
Your computer will re-set and be "ready" after a certain number of restarts and miles, depending upon how much you use the car it should take from a few days to a week. Surprised the tech didn't tell you that!
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you need to get the computer scanned and see what codes are present auto zone does it for free you cant pass an emission test with a check engine light on or right after you clear the codes it has to be driven and be in a ready status to pass hope this helps
You have to drive the car at least 50 miles or more after you have had the computer cleared out. The computer has 3 or 5 monitors that keep track of the emission and fuel system. You may have to drive it even further but the best way to find out the problem is. is to find a shop that has a computer that can check out the system to see why it does not get ready. usually it is a o2 sensor but you need a scope that monitors each sensor.
Sensors do not always fix engines,if he replaced the o2 sensors,they most likely where not the problem,o2 sensors give messages of lean,or rich mixture ,most of the time.Have you tried to clean the upper intake,tuned it up with spark plugs(from a good auto parts,not auto zone ) boots for the coils,and a good fuel injection cleaner,like LUCAS fuel treatment,and new fuel ,and air filter,,?You may need to have the fuel injectors cleaned,with a machine,replace,and check all vacuums,check the mass air flow sensor also,these can all have an effect on the engine emmissions.
it is called a drive cycle self test, this gives the computer a chance to test itself and see if all problems have been corrected and all systems are functioning properly, if the test is not done the computer will read "not ready" and u fail smog. this test can take up to a week to complete.
cORRECT. tHIS CODE DOES DEALs With emmissions. P1400 deals with the EGR valve. In case u are not aware, EGR stands for Exhaust Gas Re-circulation. What really this valve does is that it re-cycles some of the exhaust gases into the cylinder for combustion. The EGR valve might be blocked or has malfunctioned. It is advised that this valve changed or consult with a mechanic who is knowledgeable about this technology. a malfunctioned/dis-abled EGR system will cause the car to fail an emissions test, and may cause the EGR passages in the cylinder head and intake manifold to become blocked with carbon deposits, necessitating extensive engine disassembly for cleaning. So it is advised that u repair this ASAP