NHTSA Service Bulletin 10198620: 2019 Mazda Cx-5
Official manufacturer communication context for 2019 Mazda Cx-5, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.
Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.
MSP58 - DOSING CONTROL UNIT REPROGRAMMING. On the subject CX-5 vehicles, diagnosis for the Selective Catalytic Reduction (SCR) system failure may not function properly, leading to an inappropriate/delayed failure detection of the Dosing Control Unit (DCU), with codes DTC P2048 and DTC P229F. Mazda Motor Corporation has decided to conduct a Mazda Service Program (MSP) on certain 2019 CX-5 Diesel-fueled vehicles produced from March 23, 2018 through July 31, 2019. DTC P2048:00 - Urea injector circuit low input. Normally the diagnosis of urea injector coil resistance activates while the injector is operating and detects a failure based on the electric current value in the injector coil. On the subject vehicles, the diagnosis activates also while the injector is not operating due to inappropriate software of DCU, which allows the coil resistance to be temporarily judged to be normal, even if any abnormality occurs in the coil resistance value. DTC P229F:00 - NOx sensor No.2 system: NOx concentration malfunction. Normally the diagnosis of NOx sensor output characteristics (gain diagnosis) activates during IG-OFF and detects a failure based on the output value (gain value) of NOx sensor. On the subject vehicles, if a significant fluctuation occurs in the output value, the diagnosis may not be completed within the timing due to inappropriate software of DCU. This can cause delayed detection of sensor failure and lead to a delayed MIL illumination.
What this bulletin may mean before buying
Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.
Affected products listed in this communication
Buyer checklist
- Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
- Check recall campaign pages for safety actions that may require dealer repair.
- Compare this bulletin with common problem pages for the same model and component area.
- Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
- Use the used-car buying checklist and get an independent inspection.
Frequently asked questions
What is NHTSA service bulletin 10198620?
MSP58 - DOSING CONTROL UNIT REPROGRAMMING. On the subject CX-5 vehicles, diagnosis for the Selective Catalytic Reduction (SCR) system failure may not function properly, leading to an inappropriate/delayed failure detection of the Dosing Control Unit (DCU), with codes DTC P2048 and DTC P229F. Mazda Motor Corporation has decided to conduct a Mazda Service Program (MSP) on certain 2019 CX-5 Diesel-fueled vehicles.
Is a service bulletin the same as a recall?
No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.
How should a used-car buyer use this bulletin?
Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.
Check the exact VIN before you buy
Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.
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