GM Parts Club
Most exhaust and emissions problems announce themselves well before they strand anybody. On a 2023-2026 Lyriq, these are the ones worth acting on.
1. A diesel that regenerates far more often than it used to
By the time this is obvious you are generally replacing more than one part. Start by looking at DEF injectors.
2. 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 oxygen sensors.
3. An exhaust tick on cold start that quiets as the manifold expands
This is the symptom people put off longest and regret most. Start by looking at oxygen sensors.
4. A check engine light that appears after fueling and clears itself
This is the symptom people put off longest and regret most. Start by looking at oxygen sensors.
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.
We stock genuine GM parts for every nameplate on this list and ship nationwide from Dallas. Start at our Cadillac OEM parts catalog, or search for Lyriq catalytic converters if you already know what you need.
Where to Buy
- Genuine Cadillac OEM parts
- Catalytic Converters
- Oxygen Sensors
- Def Injectors
- Diesel Particulate Filters
- Wholesale account setup
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