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P0171

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P0171 OBD-II Trouble Code: System Too Lean (Bank 1)
P0171 code definition System Too Lean (Bank 1) What the P0171 code means The P0171 code means that, on the first bank of the engine, the fuel system is running weak...

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Question
Code P0171. Do I need to take car to dealership to address this problem.
Hey there. It sounds like your throttle body is bad. Check to make sure it's clean and not sticking. Clean the throttle body if necessary and check for loose connections with the throttle body connectors, too. Since you said that...
Question
Getting error codes P0599 and P0171. Ive cleaned the O2 sensors but have no idea where to go from here.
Hello. Code P0599 is the code for an issue with the thermostat heater control circuit, while P0171 is for a lean condition on bank 1. P0599 is set when the computer detects that there is an issue with the electronically...
Question
High RPMs, but throwing the error code P0340.
Hello. P0340 is the code for camshaft position sensor circuit malfunction. A few common causes for this are a faulty cam position sensor, connector, or wiring. The first thing I would do is carefully examine the cam position sensor and...
Question
p0171, back fires at idle, lack of power and red hot catalytic conterter?
The P0171 trouble code relates to a "lean condition" and applies generally to many makes and models of cars. This simply means the air/fuel mixture is lean meaning that there is too much oxygen present in relation to the amount...
Question
My truck is losing power on take off and throwing multiple codes
Hello. The codes listed are indicative of lean conditions on both banks A and B, as well as issues with the camshaft position sensor for circuit B. A lean condition at both banks can be caused by many things. A...
Question
My car has a P0171 fuel system too lean code. The map sensor is ok at .95v, the fuel trim is at 122 and the 02 sensor is reading rich.
Hi there, thanks for writing in. The P0171 lean fuel system code can mean a variety of potential issues are at play, such as intake air leaks, a faulty front heated oxygen sensor, ignition misfiring, faulty fuel injectors, exhaust gas...
Question
Bad Purge Valve?
Hey there. All modern cars are equipped with an Evaporative Emission Control (EVAP) system. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in...
Question
Error code P0171 and P0174
The high positive long term fuel trim suggests a vacuum leak and/or inadequate fuel delivery. But there are other causes that have to be evaluated as well: bad oxygen sensor(s); dirty MAF sensor; stuck open EGR valve; weak fuel pump;...
Question
Need to know what to do with these codes generated
All the generated codes will need further inspection from a mechanic. The P0300, P0301, and P0305 are all misfires in the engine and could also cause some of the additional codes. You will need to have a diagnostics done and...
Question
Rough idle after replacing Mass Air Flow Sensor - trouble codes P0171 and P0102
The P0171 refers to a possible lack of fuel pressure, a leak in the intake air system, or a possible vacuum leak. The P0102 also leans towards a leak in the intake air system. It is possible that there is...
Question
I have codes P0151, P0171, and P0174. I have changed out my O2 sensor, but now I have all these codes
Hey there. The codes you have downloaded simply relate to malfunctions in the "engine management system." It appears codes were set for oxygen sensor voltage out-of-range, possible EGR (exhaust gas recirculation) problems such as a blockage, and a generic code...
Question
Too lean in bank 1 and bank 2
Hi and thanks for contacting YourMechanic. When the engine becomes too lean, then combustion chamber becomes very hot causing the head gasket to burn, valves begin to burn, and the rings being to seize up. Check the camshaft sensor and...
Question
Car is jerking back and forth. P0171 and P0172 codes are on.
Hello. These symptoms suggest something is causing big swings in the fuel mixture when this occurs - quite possibly the O2 sensors (pre-catalytic converter - 2 of them). P0171 is a "lean mix" warning, and P0172 is a "rich mix"...
Question
OBD-II codes P2195 and P0171 appear
P2195 and P0171 occur when the engine is running too rich (too much fuel relative to air charge) and the engine feedback system is unable to compensate. The "how can you fix this" depends on which component(s) in the system...
Question
I keep getting OBD-II codes P0171 and P0174
Since you have codes that both banks are lean then the problem will most likely be from air entering the intake manifold after the mass air sensor. The idle air control valve should not have any air leaks from the...
Question
Carbon canister making a loud hissing noise.
Hi there. The loud hissing noise could be caused by a split vacuum hose or a loose hose. Follow the hiss to make sure it is the canister and not a separate hose. The code stored for the Check Engine...
Question
My car has recently been taking about 5 minutes of cranking to start - do I need to replace the engine?
Before resorting to removing the engine, have a certified technician properly diagnose your hard starting condition. Hard starting or a long cranking situation can be caused by a number of things. The "system too lean" code can contribute to a...
Question
My truck is giving codes P0171 & P0174
Hi there. If the engine is running lean, then there could be a plugged fuel filter or a faulty fuel pump with loss of pressure. If the pressure is dropping after 20 to 25 minutes, then there could be a...
Question
Error codes P0171 and P0374
Hello. These issues can be caused by a few things. From the codes it sounds like there may be an issue with the fuel system. It may also be an issue with the air intake system allowing too much air...
Question
Error code P0171 and P0374
Hi and thanks for contacting YourMechanic. If the vehicle went into limp mode, then the computer is making this happen to prevent the engine from any damage. Check the camshaft sensor for proper timing to the camshaft. Look at the...

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