- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
A new cat what was the original code. Usually you need to drive the car for a while after changing a battery (1/2 hour to an hour) on the road so that the cpu as all the data it needs before going for etest especially the new etest machine. The place that change the cat is it the same place that is doing the emission test?
Many times The crusie control won't work either. the seedometer is triggered by a senser on the output shft of the transmission. You didn't say which car or ruck you have or which engine either so I can't tell where the senser is. The wire can come off the senser can wear out and fail the senser can start leaking and the oil can foul the electrical connection. The speedometer can fail too but it's less likly. If it did it may display the chage in miles without showing the speed.
Lots of carbon in the cylinders,EGR valve not working,a dirty or leaking fuel injector,to far advanced timing.
Run 2 cans of fuel injector in 1/2 tank of gas and run it as low as you can before refueling.
I would set the timing back 5 degrees and test again,put it into service mode (check engine light on) if you have to to get timing back to cool combustion for the test.
This should lower the no% and the co% may just pass too.
Do not use premium fuel ( which is just slower burning fuel) when doing etests,or for normal driving if your engine does not require it, It will cause carbon deposits in the combustion chamber and it will almost always give higher readings when etesting.
Did you change the air filter. The fuel filter will have no impact on emmision's but the air filter is a very common problem.If you usually drive it at low rev.'s then before you send it for emmisions test you will need to put it in a low gear and floor it for about a mile the reason is when it is being tested the engine is reved up to around 3500 rpm and any build up of unburned fuel or oil in the exhaust system will put up the emmisions reading.
O2 senser usually fail.
anything else fail??? did the inspectionstation tell you what need to be done to pass.??
do you have the print out of the inspection????
any machanic should be able to fix what ever the problem is.
I had a similar problem mine would hit a rev limiter at 3500 rpms. it would blow black sut out of the tail pipe. Ended up being mass air flow sensor/valorem sensor. almost 500.00 from nissan. fixed it though.