Why is my VW Passat losing power?
Dirty or faulty mass air flow sensor (MAF) Defective or dirty mass air flow sensor (MAF) in your VW Passat can result in loss of power, uneven engine running, erratic idling, misfires, poor exhaust emission values including black smoke.
How long do mk4 TDI last?
The main reason I purchased the VW Golf TDI is that with the diesel engine, life expectancy is 50-80% longer. A well-maintained diesel engine can easily go 400-500,000 miles.
Why is my Turbo Diesel losing power?
If the fuel filter gets clogged and the fuel does not reach the engine chamber in the right quantity then the engine will not be able to perform at its optimum level. You will feel a loss in power while accelerating and at times intermittent jerks.
What is the VW 109 power supply relay?
This relay is usually referred to as the VW “109” relay because of the relay manufacturers number printed on the top of it. It is not the actual VW part number. If you have replace or tested your VW power supply relay, and you are still having problems, check the ignition switch next. This is the electrical portion, not the key tumbler.
What does relay 109 do?
Relay 109 is the main power supply relay for A3/B4, and A4 TDIs with the ALH engine. When it fails the engine will crank but not start. Sometimes they fail intermittently. Read More… Frequently bought together… Relay 109 is the main power supply relay for A3/B4, and A4 TDIs with the ALH engine. When it fails the engine will crank but not start.
When to replace the relay 109 ECM circuit fuse?
Since prevention is much better than redemption, it makes sense to replace the weak Relay 109 ECM Circuit Fuse before it gets too hot and leaves you stranded. The upgraded version of the new Relay 109 circuit has heavier contacts which can withstand the heat better.
What happens when the power relay goes bad on a car?
Failing ECM Load Reduction Power Relays have been known to damage ECU’s when they go bad, not to mention the safety factor involved when they decide to die while you are idling in traffic or traveling on the highway!