Checking natural gas supply system for leaks — VW
Checking natural gas supply system for leaks on VW: factory workshop procedure for engines BSX, CDGA, CPGA, CPWA. Full factory text, tools and checks.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📋 Procedure
VW
Golf
2013
Golf Variant
2014
Power unit
4-cylinder direct-injection engine (1.4 l, natural gas, EA 211, turbocharger)
Edition
08.2015
Checking natural gas supply system for leaks
Chapter
“
Different pressure sections of natural gas supply system
”
Chapter
“
Determining pressure in gas system
”
Chapter
“
Determining operating mode of natural gas vehicles
”
Chapter
“
Activating/deactivating natural gas mode
”
Chapter
“
Checking gas system for leaks
”
DANGER
Risk of explosion and danger to life due to escaping natural gas. A hissing noise is a sign that there are leaks in the natural gas system. Leaks in natural gas system may lead to uncontrolled escape of natural gas.
Risk of explosion leading to serious injuries or death.
Do not perform any kind of work on the natural gas system if leaking gas can be heard.
If a gas leak can be heard (hissing), never drive the vehicle into the workshop.
Park the vehicle outside and cordon off the area.
The following chapters describes various procedures each depending on the section of the natural gas system on which repair work has been carried out.
DANGER
Risk of explosion and danger to life due to escaping natural gas.
Risk of explosion leading to serious injuries or death.
Leaks may occur after repair work has been carried out on the natural gas system. Natural gas may escape in an uncontrolled way.
After any repair work on the natural gas system, a leakage test must always be performed.
These depend on the pressure section
Chapter
“
Different pressure sections of natural gas supply system
”
that has been worked on, as well as on the actual pressure of the natural gas system
Chapter
“
Determining pressure in gas system
”
.
After working on high-pressure section, perform leakage test according to manufacturer specifications
Maintenance
Booklet
35.1
Description of work; Performing visual inspection of natural gas tanks for corrosion and leakage test
.
After working on low pressure section, perform leakage test.
Chapter
“
Checking gas system for leaks
”
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.