Only some vehicles require both a visual and/or functional check of the EGR valve system in Vista CA and Oceanside.

Symptoms of an EGR failure include rough idle and valve knock. The EGR's main purpose is to reduce emissions.

Top 3 reasons vehicles fail smog check for egr

#1 - EGR valve failure (no response to applied vacuum)
#2 - Improperly routed or missing vacuum hoses
#3 - Failed EGR switch/solenoid

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