Join the community and post your question. Use our Ask-A-Tech for free now! ASE experts standing by.

Forum > General Smog Check > Question

2000 Mazda 626 Blown Head Gasket Oil Smell from Exhaust and Check Engine Light On.

My car has a check engine light on and a little oil smell comes out of the muffler might be a blown head gasket. Will it pass smog?
Answer:

The illuminated check engine light on your Mazda will definitely cause it to fail the smog check; the oil smell from the muffler maybe not. The check engine light being on is an automatic failure, so we have to recommend you get that fixed first. As far as the oil smell... In itself, it's not a smog check failure, unless along with the smell there is visible smoke. A visible smoke test is part of the smog inspection process. If the smog technician notices black smoke, even if it's very little, he or she will have to fail your Mazda. The other problem with oil smell which may cause a smog check failure is the cause of the oil smell. You mentioned a possible head gasket leak. If in fact your Mazda has a head gasket leak, more then likely the emissions which the smog machine (smog test) is looking at HC, CO, and NOx will be too high to pass the smog test. For one, mixing oil with fuel in the combustion chamber will cause the fuel to not burn completely; leaving behind high levels of CO and HC. Second problem with a headgasket leak is overheating. If your vehicle is experience this problem more then likely it is producing high NOx emissions. This too will cause a smog inspection failure. We have to recommend you have your Mazda running good and strong with no noticeable engine problems before getting a smog check. More then likely the trouble codes stored in your Mazda's engine computer due to the check engine light being illuminated, will direct a smog mechanic to what needs to be fixed. posted by SmogTips Support

Related questions and answers you might find useful:

Learn How House Cleaning Business That Makes Over $2000 Every Week! This Business Is For Anyone Who Wants To Make More Money & Take Charge Of Their Future Check The Link Below https://PROFITFROMHOUSECLEANING.COM by Lela

How Do I Get a Smog Check Waiver? by Margaret

Do I Need a Smog Check This Year? by Joy

Mini Cooper DMV Registration Due in 5 Day Won't Pass Smog by anne

2001 Jeep Grand Cherokee Laredo with K&N Air Filter by David

View SmogTips.com in: Desktop / Mobile