Daniel writes on any subject based on his yes, really experiences and also those the others and topics started on facts developed by research.

You are watching: How to pass emissions without catalytic converter

There are dozens of websites, articles, and also blogs giving advice, recommendations, and tips and tricks on just how to happen a smog test, or what is additionally known as an emissions test. I won’t include one an ext article to these lot of recommendations together I think there are currently enough the end there.


Instead, I will certainly talk about a simple, no-cost method on just how to happen a smog test if your car has currently undergone one and failed due to the fact that of a bad catalytic converter. Replacing a catalytic converter is expensive. This straightforward home remedy will avoid having actually to purchase one and won't expense a penny.

Incidentally, this technique can also be used before going because that your an initial smog check to ensure that you happen the test the first time around.

If you have actually an old vehicle and you suspect it might fail a smog test due to the fact that of the age, climate you definitely should follow the suggested technique described here prior to going because that the smog test. If you know a smog test organization that supplies a totally free pre-test to identify whether or not your auto will happen then, by all means, you must use such service before actually having actually the test done. If there is no pre-test service accessible near you, a friendly community mechanic will more than most likely do a pre-test for totally free using one OBD2 scanner gadget.

Dirty and also Clean create Exhaust Systems


What i will existing here is simply one and only one simple an approach I’ve used numerous times to happen smog exam on mine old Toyota Highlander SUV. I discovered this technique when I first failed one emissions test done on this vehicle. After the first failed test, ns took mine SUV to my neighborhood mechanic to do the crucial repairs or everything was essential to pass the emissions test.

After going with a collection of diagnostic procedures and also various analysis the mechanic uncovered the problem. It was my old catalytic converter which was still the initial one installed in the vehicle. Apparently, it to be no much longer doing its job as efficiently as that should. The mechanic stated that this happens typically on old vehicles; also though the catalytic converter is quiet doing its plan job, the is not doing it as strictly as smog tools requires.

Out of curiosity i picked up my smartphone and asked Google what the price is to replace a catalytic converter. Right here is what the smartphone said me:

“Replacing a catalytic converter takes around an hour average, depending upon the vehicle; complete cost for parts and labor deserve to be $300-$3,000 or more. CarMd.com names replacing a catalytic converter as the third most common auto repair regarded a “check engine” warning light, and also estimates the average price for parts and also labor in ~ $1,029.”

What the Mechanic called Me

The mechanic then proceeded to disclose to me a secret technique of how to walk around and trick the smog device into pass the automobile without having actually to perform a costly converter replacement. Here is a person that simply saved me end a thousands dollars in repairs through a straightforward trick that he didn’t need to tell me. He could have simply as quickly told me the the converter necessary replacement, and also he would have actually made some good money out of the work. Instead, he made decision to it is in honest, a rarity in the auto fix industry.

When i expressed problem that i really didn’t want to add to more pollution by proceeding to drive with the old converter, he replied thus:

“Catalytic converters will proceed functioning and doing their task pretty well till they die completely. Smog test devices is calibrated so sensitively regarding detect also a boy inconsistency ...and the is just how a still functioning converter will certainly fail a test even though it’s still an excellent for plenty of years’ usage.”

— professional Emissions Mechanic

When it has actually reached its last days that usefulness a catalytic converter will not happen a smog check no issue what sort of trickery is provided to cheat the smog machine.

I have used this trick to cheat smog equipment year after ~ year for 4 consecutive years till I replaced my vehicle with a brand-new one. I’ve additionally recommended this an approach to human being I recognize with old vehicles and they have told me it succeeded in practically every case at every smog test. The few exceptions the it didn’t occupational was as soon as the difficulty was not pertained to catalytic converter failure or the converter had reached its last days.

At this point in this post you have to now yes, really be irritated at my dilly-dallying before proceeding to the key subject. Forgive me. I felt the was essential to give you a little background on exactly how I involved learn around this very useful trick.

Steps to Ensure happen an plain Smog Test

I’m sure you already know the tips and also tricks on exactly how to happen a regular smog test (that is with a regular functioning catalytic converter). Yet just therefore you recognize the cheat I’m about to reveal to you, let me once again perform the different tips for passing a smog check under plain circumstances. Ns won’t enter details to describe each tip because I believe you’ve currently done her homework top top this.

Here they are:

Change the engine oil. Cleaner oil in the engine helps significantly in cleaner exhaust.Warm increase the engine. Operation your automobile for at the very least 20 minutes before a smog test.The use of fuel additives deserve to be good and bad: good if provided consistently over many months before a smog test, poor if you use the additives only for a short duration before a test.Avoid a smog check on a hot day, or carry out the test really early in the morning once the temperature is quiet cool.Prior to a smog test do a general company update: adjust your waiting filter, spark plugs, and also engine oil and filter. If your car is yes, really old, say over 100,000 miles, girlfriend may likewise use a more heavier grade oil just until you’ve completed the smog test, returning to your typical oil great afterward.You might want to use a fuel injection cleaner a couple of weeks before the smog test. Don’t usage it too soon before the check or the will contribute to fail of the test.Do no disconnect the battery or have a jump begin immediately before the smog test. This will certainly surely make the auto fail.

All the over tips are moot and also useless if girlfriend have already failed a test as result of your catalytic converter gift old. You have the right to overcome one old converter trouble (short of instead of it) only with the trick discussed below.

While countless websites, articles and blogs say the battery disconnection is a constant reason because that failing a test, and also this is in fact true, that is additionally the big SECRET that this whole article. Disconnecting the battery is the cheat on exactly how to happen a smog test. But it needs to be done correctly or it will surely cause the car to fail.

Correct Procedure to happen a Smog Test once Catalytic Converter power is Suspect

Plan ahead. Recognize well in breakthrough when you require to have actually a smog test. Plan to disconnect the battery long sufficient in advance to permit you come then drive your vehicle for at least 150 miles.Disconnect her battery the night prior to you begin the 150-mile run. This will certainly erase the internal monitors ~ above the vehicles computer.Reconnect the battery the next day. This will restart the computer’s interior self-test monitors and re-calibrate every systems. If her commute to work is 30 miles per day round trip, then you have to do about 5 days of commuting to rack increase the required mileage.Reset your odometer come zero and also start monitoring your mileage.Start her 150-mile run.At the end of the purpose of use run, friend are prepared for a smog test. Avoid doing the test on a really hot day and also do so early in the morning once the temperature is quiet cool. Operation your auto for at the very least twenty minutes to warm up the engine before the test.

You will certainly be surprised just how you deserve to do this continuously every year about the time that your yearly vehicle it is registered date.

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How not to obtain Ripped off by one Auto Mechanic

In today’s wonderful human being of brand-new gadgets, devices, appliances and strange looking thingamajigs there's no factor you should be ripped off by auto mechanics. If you own an old vehicle you can so easily defend yourself from dishonest mechanics by making use of these exceptional gadgets. V them, you have the right to make an clever diagnosis of her vehicle's problem before taking it come an auto shop.