Buick Regal Exhaust and Emissions Warning Signs You Should Not Ignore

Most exhaust and emissions problems announce themselves well before they strand anybody. On a 2018-2020 Regal, these are the ones worth acting on.

1. A diesel that regenerates far more often than it used to

This one is usually early, which is good news, because it is cheap to fix early. Start by looking at DEF injectors.

2. An exhaust tick on cold start that quiets as the manifold expands

This one is usually early, which is good news, because it is cheap to fix early. Start by looking at DEF injectors.

3. A P0420 or P0430 efficiency code

This one is usually early, which is good news, because it is cheap to fix early. Start by looking at catalytic converters.

4. A check engine light that appears after fueling and clears itself

By the time this is obvious you are generally replacing more than one part. Start by looking at diesel particulate filters.

What to Do Next

Not scheduled. Converters are warranted separately under federal emissions rules, so check coverage before you buy.

Emissions equipment varies by state of original sale on some model years.

Genuine GM parts, dealer priced, shipped from Dallas. our Buick OEM parts catalog has the full catalog, or search for Regal catalytic converters.

Where to Buy

• Genuine Buick OEM parts
• Catalytic Converters
• Oxygen Sensors
• Def Injectors
• Diesel Particulate Filters
• Wholesale account setup