Has any had code p2177 on a q50
Has anyone had p2177 on 2017 q50
Yes, the P2177 code is a relatively common one that comes up on the 2017 Infiniti Q50, as well as many other Nissan/Infiniti models. It's a general powertrain code that points to a "lean condition" on Bank 1 of the engine when it's "off idle" (i.e., when you're accelerating or cruising, not just sitting still).
What P2177 Means
The code, **P2177: System Too Lean Off Idle (Bank 1)**, means the engine's computer (ECM) has detected that there is too much air and not enough fuel in the air/fuel mixture for the bank of cylinders containing cylinder #1. The computer will try to compensate by adding more fuel, and when it reaches its maximum adjustment limit and still sees a lean condition, it sets this code and turns on the check engine light.
Common Causes on a 2017 Q50
Since this is a common issue, here's a breakdown of the most likely culprits you should investigate, starting with the easiest and most frequent:
1. Mass Air Flow (MAF) Sensor Contamination: This is a very common cause. The MAF sensor measures the amount of air entering the engine. If it gets dirty (from an aftermarket oiled air filter, for example), it can under-report the air volume, causing the computer to inject too little fuel and create a lean condition. **Start by cleaning the MAF sensor with a proper MAF sensor cleaner.**
2. Vacuum Leaks: Any un-metered air getting into the engine after the MAF sensor can cause a lean condition. This could be a cracked or loose intake hose, a faulty PCV valve, a gasket leak, or a broken vacuum line.
- Visually inspect all the intake and vacuum hoses for cracks, tears, or loose connections. A smoke test is the best way to find a vacuum leak.
3. Exhaust Leaks: A leak in the exhaust system *before* the upstream oxygen sensor (the one on Bank 1) can allow outside air to be drawn in. This makes the oxygen sensor read a high oxygen content, telling the computer the engine is running lean when it might not be.
- Check the exhaust manifold and the exhaust pipe leading to the upstream O2 sensor on the Bank 1 side (the passenger side on your Q50).
4. Clogged or Failing Fuel Injectors: If one or more fuel injectors on Bank 1 are clogged or not firing correctly, they won't deliver enough fuel, leading to a lean condition.
5. Weak Fuel Pump or Restricted Fuel Filter: A fuel pump that isn't providing enough pressure, or a clogged fuel filter, can starve the engine of fuel, causing it to run lean across the entire bank.
How to Approach the Diagnosis
Since the P2177 code is generic and doesn't pinpoint a specific failed part, a methodical approach is best.
1. Start with the Easiest Fixes: Begin by cleaning your MAF sensor and thoroughly inspecting all intake and vacuum hoses.
2. Check Fuel Trim Data: If you have access to a quality OBD-II
scanner, look at the "fuel trim" data. High positive numbers (e.g., above +10%) for long-term fuel trim (LTFT) on Bank 1 confirm the computer is trying to add a lot of fuel to compensate for the lean condition. Comparing the LTFT data for Bank 1 and Bank 2 can help you isolate the problem.
3. Professional Diagnosis: If the simple fixes don't work, it's best to take your Q50 to a qualified mechanic or a Nissan/Infiniti specialist. They have the specialized tools to perform things like a smoke test to find leaks and can properly test your fuel pressure and injector performance to find the root cause.
It's important to get this issue resolved, as an engine running too lean can cause long-term damage to components like your catalytic converter.
