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Just had. A smog check Knox reading way high how do I fix

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Add a bottle of "Gauranteed to Pass" to the gas and drive it until you need to refill again. Then it will pass. This stuff is available at all auto parts stores.

Posted on Dec 11, 2014

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Posted on Jan 02, 2017

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the two are not connected if the CO readings high then its a new cat providing the lambda sensors are working

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My nissan altima 1999 did not pass the smog test due to "high emission", it also does not have the check engine light on or give any obd codes. What could be the problem?


Robert, High emissions usually mean the EGR valve and several hoses and other smog components are clogged up. There is no easy fix, you have to get the shop to check through the smog system on your car if you cannot do it yourself. Type of driving, short runs, high miles, burning oil etc all contribute to the engine giving a dirty reading. It may not be enough to light the lamp but it'll be dirty enough. Of cause, it may be the lamp is bust as well? Does it test light when you start up?

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This code is send (in your case NOT SEND)
by the fuel sending unit.

Does your fuel gauge give incorrect of jumpy reading when it's full?

The quick fix is STOP TOPPING OFF the fuel tank when you are get gas.

Keep topping off will push the fuel tank float off it's sensor limit and eventually short or send OUT OF RANGE reading to the fuel gauge.

Fill your truck up to 3/4 tank full.

Drive it for 2-3 days or about 100 miles.
(this will fill the ready-ness data that DMV want)

If there is NO check engine light ON during the 2-3 days then give the smog test another shot.

DO NOT add fuel unit you complete the smog test.
===

The CORRECT method to fix your problem is to drop the gas tank and replace the fuel sending unit.

If you truck has over 140,000 miles on it then I will recommend you the change the WHOLE integrated fuel pump/fuel sending unit and fuel filter at the same time.

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My ''nox'' emissions was to high on smog test?


Usually a high NOx reading on gasoline vehicles is caused by a bad catalytic converter on your exhaust. I would suggest having this checked out before you try the test again. Hope this helps.

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CA you can take the car to a referree and get a one time waiver if you have spent a minimum of $450 on repairs not including smog fees. Gives you two years to get it fixed. Smog Referee Call Center
Toll Free: 1.800.622.7733
You can also sell the car to the state for "up to" $1,000

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if i were you i would contact cragen and ask them if the car has it and how much the replacement part is

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