Background
In May 2019, the plaintiff purchased a new Sunlight T58 motorhome equipped with a Fiat Ducato 2.3-liter Multijet engine (96 kW, Euro 6 emissions class). The motorhome is alleged to contain unlawful emission control defeat devices—specifically a “Thermofenster” (thermal window) and “Timer”—that reduce or disable the exhaust gas recirculation system outside defined temperature parameters, causing nitrogen oxide emissions to exceed regulatory limits. The plaintiff sued the vehicle manufacturer (who holds the type approval for the base vehicle) for damages, seeking restitution of the purchase price less depreciation, establishment of liability, recovery of additional damages, and pre-litigation attorney fees.
The trial court and appeals court both rejected all claims. The appeals court refused to allow a final appeal (Revision), prompting the plaintiff to file a non-admission appeal (Nichtzulassungsbeschwerde) challenging the court’s refusal. The appeals court’s dismissal rested on the finding that the plaintiff presented no concrete evidence of illegal emission control devices.
The Court’s Holding
The Federal Court of Justice granted the plaintiff’s non-admission appeal and reversed the lower court decisions. The court held that the appeals court violated the plaintiff’s fundamental constitutional right to be heard by failing to meaningfully consider key evidence submitted by the plaintiff. The appeals court had dismissed the case claiming the plaintiff cited documents that did not clearly reference the specific engine in question and were “largely general statements about motors.” However, the plaintiff had presented an expert software report analyzing an engine with identical model designation and performance specifications as the contested engine. The court ruled that once such matching specifications were established, the appeals court had an obligation to explain why the expert findings were nonetheless inapplicable or inadequate. The court’s silence on this issue permitted the inference that the plaintiff’s evidence was not properly considered at all.
The court also clarified that the appeals court improperly imposed excessive evidentiary burdens on the plaintiff’s “Thermofenster” claims. Under established precedent, it is sufficient to allege that exhaust gas recirculation functions normally only within a certain temperature range defined by engine control software but is reduced or disabled in real operating conditions depending on ambient temperature, with the result that nitrogen oxide emissions exceed legal limits. Detailed technical specifications about the precise temperature range are not required when the parties dispute only the ambient temperatures at which recirculation is reduced and deactivated. The plaintiff’s evidence met this standard. The court remanded the case to the appeals court for new proceedings with instruction to properly weigh the plaintiff’s evidence.
Key Takeaways
- The constitutional right to be heard requires courts to genuinely consider all substantive party submissions that form the core of a party’s position and are decisive to the outcome; silence about an argument permits inference that it was not properly considered.
- In emissions control defeat device cases, plaintiffs need not provide exhaustive technical detail about how a device functions; it suffices to show that emission controls operate differently under test conditions than in real-world operation at temperatures typical in the relevant jurisdiction.
- When expert evidence pertains to an engine matching the specifications of the engine in the contested vehicle, courts must conduct meaningful analysis and explain why such evidence is nonetheless inapplicable rather than summarily dismissing it.
- The case is remanded for reconsideration; the appeals court’s non-admission of appeal is reversed as to costs and the defendant’s processual treatment.
Why It Matters
This decision reinforces procedural fairness in automotive defect litigation involving emissions control systems. It establishes that courts must engage substantively with technical evidence and cannot erect artificial evidentiary barriers that would effectively insulate manufacturers from liability for defeat devices. The holding emphasizes that the right to be heard is not merely formal procedure but requires genuine consideration of parties’ arguments—a critical safeguard in complex technical litigation where consumers often face asymmetric access to expertise.
The decision also clarifies the evidentiary standard for “Thermofenster” (thermal window) allegations, a recurring issue in German diesel engine litigation since the Volkswagen emissions scandal. By clarifying that detailed temperature-range specifications are unnecessary when the core dispute concerns only the range of temperatures activating defeat mechanisms, the court facilitates access to justice in consumer protection cases. However, the court noted a significant caveat: manufacturers may escape intentional tort liability under § 826 BGB if they demonstrate that the relevant Italian regulatory authority, after being informed of technical concerns, conducted investigations and thereafter publicly represented the devices as safe for years without intervention—suggesting that manifest regulatory forbearance might shield manufacturers from tort liability despite technical defects.