Check Engine Light Flashing

The check engine light flashing on your 2020 Mercedes-Benz GLS-Class is a serious indication that a misfire or other urgent issue is creating excessive heat or catalytic converter risk. A flashing light typically means the engine is misfiring, which can allow unburned fuel into the exhaust stream and rapidly damage costly components like the catalytic converter. At Mercedes-Benz of Lynnfield we treat flashing indicators as priority. Our factory-trained technicians perform immediate diagnostics with OEM-level scanners, assess whether towing is required, and identify whether a simple ignition coil or spark plug replacement will resolve the issue or whether deeper engine or turbocharger work is necessary. We also explain the immediate and long-term savings of addressing problems now—preventing catastrophic failures and preserving fuel economy, emissions compliance, and resale value. Check for current savings and manufacturer-backed offers in our service specials. If you see a flashing light, do not delay: contact us or schedule service online for expedited care and full warranty protection.

2020 Mercedes-Benz GLS-Class Check Engine Light Codes

Common diagnostic trouble codes for the 2020 Mercedes-Benz GLS-Class often involve oxygen sensors (P0130–P0167), turbocharger boost control or wastegate issues, misfire codes (P0300–P0312), and catalytic converter efficiency faults (P0420). Ignoring these codes risks reduced fuel economy, higher emissions, and expensive downstream repairs. For example, an unresolved oxygen sensor fault can reduce mpg and damage the catalytic converter; a misfire left unaddressed can harm pistons and the exhaust system. At Mercedes-Benz of Lynnfield we provide accurate code interpretation, transparent cost estimates, and a clear repair plan. Our technicians explain cost vs. benefit—how prompt OEM repairs protect the vehicle’s performance and save money over time. We also offer service financing so you can address recommended repairs immediately. Conveniently located in Lynnfield, MA, our dealership combines quick turnaround, OEM parts, and factory-trained technicians to give you confidence and long-term value when resolving any check engine code.

2020 Mercedes-Benz GLS-Class Check Engine Light Reset

Resetting the check engine light on a 2020 Mercedes-Benz GLS-Class should only follow a proper repair. While a code can be cleared with a scanner, the light will return if the underlying fault remains. At Mercedes-Benz of Lynnfield we reset systems only after diagnosing and fixing the root cause—this preserves transparency and prevents repeat visits. Our service includes verifying repairs with post-repair scans, road testing, and documentation to protect warranty coverage. Choosing dealership service means OEM parts, certified technicians, and alignment with manufacturer records—important for maintaining coverage and resale value. We also provide clear estimates, available service specials, and service financing options so you can complete recommended work now and pay over time. To protect your GLS-Class, avoid quick resets at unverified shops; instead schedule appointment with Mercedes-Benz of Lynnfield for confident, lasting results.