Question 1

Why did my car fail smog?

Accepted Answer

A check engine light is the most common cause.

A failed oxygen sensor is the next most common cause.
Catalytic converter degradation is another common cause.
Readiness monitors not set

Per BAR Consumer Assistance Program guidelines.

Question 2

Will a check engine light fail my smog check?

Accepted Answer

Yes — it is an automatic fail in California. It must be resolved before the retest. It can stem from something minor like a gas cap, or from a major sensor. Do not clear the code right before testing. Per BAR Consumer Assistance Program guidelines.

Question 3

Can a loose gas cap fail my smog?

Accepted Answer

Yes — it triggers an evap code. The fix is easy: tighten or replace it. Drive 100-150 miles after fix. Monitors need to reset. Per BAR Consumer Assistance Program guidelines.

Question 4

How many times can I retest after failing?

Accepted Answer

Unlimited retests are allowed. You must pay the inspection fee each time. There is no certificate fee until you pass. CAP can help with repair costs. Per BAR Consumer Assistance Program guidelines.

Question 5

Is the retest free if I just failed?

Accepted Answer

It depends on shop policy. Many shops offer a free or discounted retest within 30 days. A free retest is typically only at the same shop. Ask at time of original inspection. Per BAR Consumer Assistance Program guidelines.

Question 6

What is the Consumer Assistance Program?

Accepted Answer

CAP provides up to 1,450 dollars of repair aid for 1996-and-newer vehicles. The vehicle retirement option is 1,350-2,000 dollars. Income-eligible or DMV-directed qualify. Apply through BAR before repairs. Per BAR Consumer Assistance Program guidelines.

Why did my car fail smog?

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