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What else can I help you with?
Will a bad catalytic converter cause you to fail the emissions portion of the smog test?
Yes!
Can a bad air conditioning unit cause emission test to fail?
No
Will the knock sensor cause A car to fail a smog test?
Yes. Any faulty emissions control sensor, including knock sensors, will result in an automatic fail of any emissions control test, period. It doesn't even matter if your vehicle's actual exhaust emissions are within acceptable limits. In most cases, once it is determined that a sensor is bad, the test is ended immediately, and considered failed.
Does a bad egr valve cause you to fail a state emissions test?
Yes it does and the code that was given to me for that was P400 and p1491
Will a smog test deterime if you have a bad spark plug or wire?
No. It will just report that emissions are too high. The report may list spark plugs or wires as a possible cause for the high emissions. But the test itself cannot pinpoint them as the cause.
Would service engine light come on if gas cap bad?
On some vehicle it does as it is supposed to be vented through a canister and not the cap for emissions reasons. Another reason you fail a smog test if check engine light is on.
Will bad oxygen sensors cause me to fail the emissions test?
Problems with the oxygen sensors are quite likely to cause emissions test problems. The car computer cannot properly adjust the air/fuel mixture to regulate the emissions.
Why should you not cram during a test?
You will fail and may get bad grades.
Where are the Oxygen sensors location by banks which side is the right bank on a 1996 Mazda B4000?
Oxygen sensor is on the exhaust. It controls fuel injectors, and if bad will cause "check engine" and will fail at smog test. They cost about $50. I replace them every 2 years. Right and left are determined from sitting in the drivers seat. Right is passenger in the USA.
Can a bad crank sensor cause fuel pump to fail?
No.
Can automotive smog test tell you if you have a bad wire or spark plug?
A smog test may indicate that one or more cylinders is not firing, but it will not tell which one or the cause. An error code in the computer may narrow it down, but it will generally only point in a direction, not a specific thing. If the vehicle is equipped with an OBDII Engine management system then A defective spark plug or spark plug wire will usually cause an engine misfire which will usually set a stored code, depending on the severity. A misfire will cause higher emissions that will show up in a smog test but the failure results will not specificially pin-point the failed component. Many instances of engine misfires and smog test failures can be due to the OEM spark plugs have never been replaced, especially if they have > 60,000 miles. Many times I have corrected smog failures due to mis-fires with spark plug replacement.
What happens if air pump is bad on vehicle?
The vehicle may fail the emissions test.
