The Vauxhall A16LET is a 1,598 cc, inline‑four turbo‑charged petrol engine produced between 2007 and 2011. It features a DOHC 16‑valve layout with variable valve timing (VVT) and direct fuel injection (SIDI). In standard form it delivered 132 kW (180 PS) and 230 Nm of torque, enabling brisk performance with improved fuel economy over prior port‑injected units.
Fitted primarily to the Astra H GTC and VXR models, the A16LET was engineered for sporty driving dynamics with ev…
Production years 2007–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Vauxhall A16LET is a 1,598 cc inline‑four turbo‑petrol engineered for compact performance models (2007–2011). It combines spark‑ignited direct injection (SIDI) with variable valve timing to deliver responsive power and refined operation. Designed to meet Euro 4 standards, it balances sporty performance with acceptable fuel consumption.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,598 cc | |
Fuel type | Petrol (RON 95 min) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 79.0 mm × 81.5 mm | |
Power output | 132 kW (180 PS) @ 5,500 rpm | |
Torque | 230 Nm @ 2,200–4,000 rpm | |
Fuel system | Bosch HDP5 high-pressure direct injection (up to 120 bar) | |
Emissions standard | Euro 4 | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | Garrett GT1549V variable‑boost turbo | |
Timing system | Chain (front‑mounted) | |
Oil type | GM Dexos2 (SAE 5W‑30) | |
Dry weight | 138 kg |
The Vauxhall A16LET was used across Vauxhall's Astra H platform with transverse mounting and no external licensing. This engine received platform-specific adaptations-reinforced engine mounts in the GTC and upgraded cooling in the VXR-and from 2008 the facelifted Astra H MY08 models adopted revised ECU calibrations, creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
The A16LET's primary reliability risk is high-pressure fuel pump (HPFP) wear, with elevated incidence in vehicles using low-quality fuel or extended service intervals. Vauxhall internal data from 2011 indicated a measurable uptick in HPFP-related warranty claims before 100,000 km, while UK DVSA records show no significant emissions failure correlation. Fuel quality and oil change discipline make HPFP longevity critical.
Analysis derived from Vauxhall technical bulletins (2009–2013) and UK DVSA failure statistics (2015–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The A16LET offers strong performance and decent efficiency, but early models (2007–2009) had HPFP reliability concerns. Later units improved pump durability, so well-maintained examples can be robust. Regular servicing and using high-quality RON 95+ fuel and GM Dexos2 oil greatly aid longevity.
The biggest issues are high-pressure fuel pump wear, turbo oil seal leaks, carbon buildup on intake valves (due to direct injection), and brittle intercooler pipe couplings. These are documented in Vauxhall service bulletins TIS 09‑034 and 07‑022.
This 1.6L turbo petrol was used in the Astra H GTC (2007–2011) as the 1.6 Turbo and VXR, and briefly in the Astra H Hatchback SRi (2008–2009). It was not used in Insignia or other Vauxhall lines, and was not licensed to other manufacturers.
Yes. The A16LET responds well to ECU remapping, with stage 1 tunes typically yielding +20–30 kW safely. Stock internals handle up to ~220 PS reliably. Supporting mods like a better intercooler, exhaust, and HPFP upgrade allow further gains. Always use RON 98 fuel with tuned engines.
In an Astra GTC 1.6 Turbo, typical consumption is ~9.5 L/100km (city) and ~6.0 L/100km (highway), or about 35 mpg UK combined. VXR models are thirstier—expect 30–38 mpg UK depending on driving style. Real-world economy varies significantly with boost usage.
Yes. The A16LET is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, causing catastrophic damage. While the chain is generally durable, any unusual timing noise should be investigated immediately.
Vauxhall specifies GM Dexos2 5W‑30 synthetic oil. This is critical for HPFP lubrication and turbo protection. Always change oil every 10,000 km or 12 months, whichever comes first, especially in stop-start or high-load use.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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