VW Amarok Performance Drop: Fuel Mix Troubles Ahead

Had nearly identical symptoms with my 2012 VW Tiguan. The rough running and power loss were classic signs of faulty fuel injectors affecting the air-fuel ratio. The check engine light flashing typically indicates a serious misfire that could damage the catalytic converter if left unchecked. Initial diagnostics showed multiple cylinder misfires. Two injectors were completely clogged, causing uneven fuel delivery. This explained the increased fuel consumption and jerky acceleration. The repair required removing and cleaning all injectors, replacing two that were beyond salvage, and performing a full injection system calibration. This is not a quick fix job, proper diagnosis and repair takes time to ensure all injectors are functioning correctly and the fuel delivery is balanced across all cylinders. The symptoms you describe match almost exactly what happens when injectors start failing, and it can cascade into more serious engine damage if not addressed. Consider getting the fuel system cleaned and checking the air filter while the work is being done. A clogged air filter can contribute to similar symptoms and its often overlooked during basic maintenance. Recommend finding a shop that specializes in VW fuel injection systems, as proper diagnostic equipment and expertise are essential for this repair.

Thanks for sharing those details about the injector issues. My Amarok had identical problems last year. The shop found contaminated fuel had damaged the injectors, plus a worn oxygen sensor was causing the rich mixture condition. Really interested in knowing how much the full repair set you back? Also, have you noticed any other issues pop up since getting it fixed? My check engine light occasionally flickers but the engine runs fine.

Thanks for asking about the follow-up. The repair cost came to 515€ for replacing the faulty injection valve, which resolved the rich fuel mixture completely. The engine has been running perfectly balanced since the fix, no more excessive fuel consumption or performance issues. The air-fuel ratio is now spot-on, and both the oxygen sensor and spark plugs are working as they should. The repair also helped protect the catalytic converter from potential damage that rich running conditions can cause. Regarding your flickering check engine light, even though your engine runs fine, it might be worth checking the oxygen sensor connections. A loose connection can trigger intermittent warnings without affecting performance. The sensor readings directly influence fuel economy, so its worth keeping an eye on. In my case, no other issues have emerged in the months since the repair. The fuel injection system has maintained proper pressure and spray patterns, keeping fuel delivery consistent across all cylinders.

Thanks everyone for the helpful replies. Finally got my Amarok sorted last week. Wanted to share how it went in case others run into similar problems. Took it to a specialized workshop after reading the responses here. The mechanic found two problems: a failing oxygen sensor causing the rich mixture and a cracked intake manifold gasket letting in extra air. The check engine warning made sense once they showed me the diagnostic readings. The full repair came to 680€ including parts and labor. They replaced both the sensor and gasket, then did a complete system check. Engine runs smooth now, no more jerking or excessive fuel consumption. Power delivery is back to normal and the warning light has stayed off. Really glad I asked here first. Helped me understand the likely issues before going to the shop, so I could have a more informed discussion with the mechanic about the needed repairs.