Orlando P0171 unresolved issue?

[KissezFun]

Greetings, experts. I am experiencing an issue with my Orlando with the replacement of the turbo, which is manufactured by Jrone. Following the replacement in the garage, the vehicle operated normally. However, the subsequent day, after a few minutes of operation, it began to stutter. Upon connecting a fault scanner, I observed that the oxygen sensor was fixed at 35%. I returned to the garage, where they disassembled the oxygen sensor, revealing it to be blackened with soot. They replaced it with a new one, yet within two minutes of driving, the stuttering recurred, and the scanner again indicated 35%. The vehicle consumes excessive fuel and emits smoke. The technicians suggested that the mass air flow (MAF) sensor was defective, despite it displaying normal values. After replacing the MAF, the issue persisted, and a fault code P0171 was recorded. They proposed that the positive crankcase ventilation (PCV) system in the manifold might be compromised, which was confirmed upon inspection. They suggested replacing my valve cover, claiming a valve PCV had failed, although no air noise was detected. I feel utterly helpless and uncertain about the next steps, as it appears that everyone is evading responsibility. The uncertainty is burdensome; does anybody have suggestions on how to proceed?

[p00rmansp0rsche]

You may examine potential components of your own post. Firstly, what does the code P0171 signify?
The P0171 code signifies that the air-fuel mixture in your vehicle's engine is too lean, indicating an excess of air and a deficiency of fuel. This may result from several factors, including defective or contaminated mass airflow sensors, inadequate fuel pumps, malfunctioning oxygen sensors, fuel system complications, and vacuum leaks.

What inspections have you conducted on the fuel pumps and/or the obstructed fuel filter that may be impeding fuel flow? When was the gasoline filter last replaced on the 2014 model vehicle?
You refer to 'emits smoke'... what is the hue, light grey or black smoke? The colour of smoke is essential for diagnosis. Examining the hue of the smoke online may provide useful insights.

When was the air filter recently inspected, cleaned, or replaced? Ensure it is properly inserted and sealed effectively.

Your initial Sign-Up did not specify the vehicle's engine variant—only the year 2014 was mentioned. Understanding the engine may be beneficial.

[KissezFun]

Thank you for the prompt response; the engine is an A14net 1.4 turbo. The emitted smoke is black, leaving a discernible mark on the road both when the vehicle is in motion and stationary. The vehicle does not overheat; however, I observed that two days post-turbo replacement, the oil transitioned from new to black. The original AC Delco spark plugs were replaced, and all issues commenced the day following the turbo installation. Prior to this, the car operated optimally, with the exception of the turbo. Both the air filter and oil filter are new.

[Rashman4u]

Having determined it is Black Smoke, you may readily research the potential reasons.

[KissezFun]

A brief update: I replaced the valve cover, and post-replacement, the vehicle operated as if it were new, exhibiting normal readings from both the oxygen sensor and the MAF sensor. The car functioned smoothly without issues, eliciting my excitement akin to that of a new vehicle. However, after 15 minutes of driving, I halted at a traffic light, and the car began to shake once more. The oxygen sensor reading dropped to 35%, along with the trim, and black smoke re-emerged from the exhaust, indicating excessive fuel consumption. Perhaps this information will assist in resolving the issue?