The Volvo D 4204 T12 is designated as a diesel engine, but its displacement, configuration, and verified production years cannot be confirmed. No technical specifications, power outputs, or core technologies are documented in accessible Volvo TIS, ETK, or VCA regulatory filings. No verifiable technical term or plain-English anchor can be provided at this time.
The specific Volvo vehicle platforms or models fitted with the D 4204 T12 engine code are not identifiable from authoritative sources. Its intended driving character, emissions technologies employed, and baseline compliance standard (e.g., Euro X) remain undocumented in the public OEM or government repositories available for verification.
No OEM-verified reliability concerns, generational updates, or relevant service bulletins for the D 4204 T12 engine could be located. No engineering documents from Volvo were found to reference this specific engine code, preventing documentation of any known issues or transitions.

Insufficient data available to determine emissions compliance for the D 4204 T12 engine (No VCA or EU regulatory reference found).
The Volvo D 4204 T12 is a diesel engine of unknown configuration, intended for unknown vehicle types. It combines unknown technologies to deliver unknown driving characteristics. Designed to meet unknown emissions standards, its performance and economy profile is undocumented.
| Parameter | Value | Source |
|---|---|---|
| Displacement | Unknown | |
| Fuel type | Diesel | |
| Configuration | Unknown | |
| Aspiration | Unknown | |
| Bore × stroke | Unknown | |
| Power output | Unknown | |
| Torque | Unknown | |
| Fuel system | Unknown | |
| Emissions standard | Unknown | |
| Compression ratio | Unknown | |
| Cooling system | Unknown | |
| Turbocharger | Unknown | |
| Timing system | Unknown | |
| Oil type | Unknown |
Driving character and maintenance requirements for the D 4204 T12 engine are unknown due to lack of OEM documentation. No verified fuel quality requirements or key reliability considerations can be provided. No operational advice or upgrade references are available from authoritative sources.
Oil Specs: Oil specification unknown (No OEM document found).
Emissions: No Euro certification data available (No VCA or EU reference found).
Power Ratings: Power ratings unknown (No measurement standard or OEM document found).
No verifiable primary sources (OEM, VCA, SAE, ISO) found for engine code 'D 4204 T12 - Diesel'.
The Volvo D 4204 T12 engine's application across Volvo's platforms is unknown. Mounting type, platform-specific adaptations, facelift details, and licensing partnerships cannot be verified. All adaptations are documented in OEM technical bulletins - however, none pertaining to this engine code were located.
No authoritative guidance for identifying the D 4204 T12 engine is available. Location of engine code stamping, VIN identification details, visual cues, or critical differentiators from similar engines cannot be provided. No service parts compatibility warnings with OEM document references exist in the verifiable public domain.
No primary reliability risk for the D 4204 T12 engine can be identified from OEM or government sources. No quantified statistics from Volvo internal reports or agencies like DVSA/NHTSA are available. Without verified data, no specific usage factors or mitigation strategies can be recommended.
Analysis derived from Volvo technical bulletins (No data found) and government agency failure statistics (No data found). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO D-4204-T12.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with VOLVO or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
VOLVO Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialVOLVO documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.