<div class="article-entry"><p>Do you know what the #1 reason is that cars don’t pass their smog check? According to Diamond Certified smog check experts, a “check engine” / “service engine soon” light ON and/or high tail pipe emissions are the main reasons. The state sets the maximum allowed limits for hydrocarbons, carbon monoxide, oxides of nitrogen, referred to as “NOX”. A worn out catalytic converter can also be one of the many causes for not passing.</p><p>Each smog check station has its own policy as to whether they charge you for a failure. The state does not regulate that. In general, shops set their own prices for all smog checks, other than the state regulated $8.25 for the Smog Certificate.  If your car fails the smog test close to the registration deadline, you may ask DMV for an extension to make failed smog related repairs.</p></div>

Why Cars Don&#039;t Pass Smog Checks | Diamond Certified

Chris Bjorklund

<p>Do you know what the #1 reason is that cars don’t pass their smog check? According to Diamond Certified smog check experts, a “check engine&#8221; / &#8220;service engine soon&#8221; light ON and/or high tail pipe emissions are the main reasons. The state sets the maximum allowed limits for hydrocarbons, carbon monoxide, oxides of nitrogen, referred to as &#8220;NOX&#8221;. A worn out catalytic converter can also be one of the many causes for not passing.</p>
<p>Each smog check station has its own policy as to whether they charge you for a failure. The state does not regulate that. In general, shops set their own prices for all smog checks, other than the state regulated $8.25 for the Smog Certificate.  If your car fails the smog test close to the registration deadline, you may ask DMV for an extension to make failed smog related repairs.</p>


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Why Cars Don't Pass Smog Checks | Diamond Certified

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Why Cars Don&#8217;t Pass Smog Checks

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Why Cars Don’t Pass Smog Checks

Do you know what the #1 reason is that cars don’t pass their smog check? According to Diamond Certified smog check experts, a “check engine” / “service engine soon” light ON and/or high tail pipe emissions are the main reasons. The state sets the maximum allowed limits for hydrocarbons, carbon monoxide, oxides of nitrogen, referred to as “NOX”. A worn out catalytic converter can also be one of the many causes for not passing.Each smog check station has its own policy as to whether they charge yo

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