The Land Rover Ingenium engine family includes both petrol and diesel variants across 2.0-litre and 3.0-litre configurations. This guide shows you exactly how to tell them apart, how to identify your engine code, and what to check when buying a replacement.
You can tell petrol and diesel Ingenium engines apart by checking the engine code label, the fuel filler cap, and the 8th character of your VIN. The 2.0-litre petrol Ingenium is coded 204PT (or AJ200P), while the 2.0-litre diesel is 204DTD (or AJ200D). The 3.0-litre petrol is 306PS (AJ20P6), and the 3.0-litre diesel is AJ20D6. Diesel engines also have a fuel filler neck designed for AdBlue nozzles.
If you're unsure which engine is in your Land Rover, this guide will walk you through the identification process step-by-step.
The table below lists every Land Rover Ingenium engine variant, with its fuel type, engine code, power outputs, and key identification markers. This is the definitive reference for telling petrol and diesel Ingenium engines apart.
| Engine Name | Engine Code | Fuel Type | Displacement | Power Outputs | Key Models |
|---|---|---|---|---|---|
| 2.0 Petrol Ingenium | 204PT (AJ200P) | Petrol | 2.0L (1,997cc) | 200–300 PS (P200, P250, P300) | Discovery Sport, Evoque, Velar |
| 2.0 Diesel Ingenium | 204DTD (AJ200D) | Diesel | 2.0L (1,999cc) | 150–240 PS (D150–D240) | Discovery Sport, Evoque, Freelander 2 |
| 3.0 Petrol Ingenium | 306PS (AJ20P6) | Petrol | 3.0L (2,996cc) | 340–400 PS (P340, P400) | Range Rover, Range Rover Sport, Defender |
| 3.0 Diesel Ingenium | AJ20D6 (AJ300) | Diesel | 3.0L (2,993cc) | 300–350 PS (D300, D350) | Range Rover, Range Rover Sport, Defender, Discovery |
Key differentiators: The petrol and diesel Ingenium engines share the same basic architecture but have different fuel systems, compression ratios, and emission control equipment. The diesel engines (204DTD, AJ20D6) have AdBlue/SCR systems and DPF, while the petrol engines (204PT, 306PS) do not. This has significant implications for reliability, running costs, and replacement decisions.
Enquiry data shows the diesel Ingenium is more frequently enquired about: 1,150 requests for 204DTD in 2025 [EM-VERIFIED] compared to 480 for the 204PT petrol [EM-VERIFIED]. However, as noted in our failure rate data, higher enquiry volume does not necessarily indicate a higher failure rate — it may reflect a larger vehicle parc.
There are four reliable ways to confirm whether your Land Rover has a petrol or diesel Ingenium engine. Use the method that best suits your situation.
Open the bonnet and locate the engine code label on the timing cover or cylinder head. The code will be clearly stamped as 204PT (petrol 2.0), 204DTD (diesel 2.0), 306PS (petrol 3.0), or AJ20D6 (diesel 3.0). This is the most direct and reliable method.
Your vehicle's VIN (Vehicle Identification Number) can be decoded to reveal the engine type. The 8th character of the VIN indicates the engine. For the 204PT petrol, the 8th character will typically be D (200 PS), E (250 PS), or F (300 PS). For the 204DTD diesel, it will be a different letter. You can verify this using a free online Land Rover VIN decoder.
Diesel Ingenium engines have a larger fuel filler neck designed for AdBlue nozzles (blue ring around the neck). Petrol engines have a standard unleaded filler neck. This is a quick visual check that doesn't require opening the bonnet.
The V5C logbook includes the engine number and fuel type. While this is less direct than the other methods, it is a useful secondary check if the engine label is not accessible.
If you're still unsure, the Engine Compatibility Checker can help you match your vehicle details to the correct engine.
Getting the engine code right is critical — especially if you are considering a replacement. Installing the wrong engine variant can lead to:
Always check the Engine Code Guide and consult a specialist before purchasing a used or reconditioned engine. The Ingenium petrol (204PT) is generally considered more reliable than the diesel (204DTD), but both are complex engines that require specialist knowledge for replacement.
For real-world cost guidance, see our replacement cost by engine code page. And if your Ingenium has failed, the Ingenium diesel timing chain failure page (for diesel) or 204PT timing chain page (for petrol) provides detailed insight into common issues.
The Ingenium engine family is frequently confused with other Land Rover engines. Here's what to look out for to avoid a costly mistake.
These share the same 2.0-litre displacement and basic architecture but are completely different engines with different fuel systems, compression ratios, and ECUs. The diesel has a DPF and AdBlue system; the petrol does not. The engine code is the only reliable way to tell them apart.
Read about the 204DTD diesel Read about the 204PT petrolBoth are 3.0-litre straight-six Ingenium engines, but one is diesel and one is petrol. The diesel (AJ20D6) has DPF and AdBlue; the petrol (306PS) does not. They have different engine codes, fuel filler necks, and ECU mappings. Do not confuse them.
Read about the AJ20D6 diesel Read about the 306PS petrolEarly Ingenium engines (pre-2019) have known timing chain tensioner issues (especially on diesel) and cooling system problems (on petrol). Later revisions (2019+) are more robust. When buying a replacement, the newer revision is preferred. Always check the production date of the donor engine.
Read about Ingenium timing chain issuesIf you are still unsure, use the full Land Rover fitment matrix or contact a vetted Land Rover specialist to confirm the right engine for your car.
The most reliable way is to check the engine code label on the timing cover. 204PT = 2.0 petrol, 204DTD = 2.0 diesel, 306PS = 3.0 petrol, AJ20D6 = 3.0 diesel. You can also check the fuel filler neck (diesel has a blue AdBlue ring) or the 8th character of your VIN.
204PT is the 2.0-litre petrol Ingenium. 204DTD is the 2.0-litre diesel Ingenium. They share the same basic architecture but have different fuel systems, compression ratios, and emission control equipment. The diesel has a DPF and AdBlue system; the petrol does not.
Generally, yes. The petrol Ingenium (204PT, 306PS) is considered more reliable than the diesel (204DTD, AJ20D6). The diesel has known timing chain tensioner issues (pre-2019), oil dilution problems from DPF regeneration, and EGR cooler failures. The petrol's main weakness is the water pump and cooling system.
Not directly. Petrol and diesel Ingenium engines have different engine mounts, fuel systems, ECU systems, exhaust layouts, and wiring looms. A conversion is technically possible but prohibitively expensive and rarely worthwhile. Always replace like-for-like.
Based on our internal quote data [EM-QUOTE], a reconditioned 204PT petrol engine supply-only ranges from £3,000 to £5,000. A reconditioned 204DTD diesel engine ranges from £3,500 to £5,800. Fitting costs (R&R labour) at an independent specialist are typically £650–£910. A used engine may be cheaper, but condition is key.
2.0 petrol: 204PT (AJ200P). 2.0 diesel: 204DTD (AJ200D). 3.0 petrol: 306PS (AJ20P6). 3.0 diesel: AJ20D6 (AJ300). You can find the code on a label on the timing cover, or by decoding the VIN.
The choice between petrol and diesel Ingenium depends on your usage and tolerance for risk. The petrol Ingenium (204PT, 306PS) is generally more reliable, with lower running costs and fewer catastrophic failure modes. The diesel Ingenium (204DTD, AJ20D6) offers better fuel economy and torque for towing, but has known timing chain, oil dilution, and EGR issues that can be expensive to repair.
If your Ingenium has failed and the cost of replacement exceeds approximately 60% of your Land Rover's current market value, you may need to consider whether replacement is financially viable. However, given the high retained values of modern Land Rovers, a reconditioned engine is often a sensible investment — especially if you choose the petrol variant.
Always use a vetted Land Rover specialist for the work, and ensure the replacement engine is correctly coded to your vehicle's ECU. For diesel engines, pay particular attention to the timing chain tensioner revision (pre-2019 vs post-2019).
Use the Repair vs. Replace CalculatorReady to check your engine or get a quote? Compare prices from vetted specialists.