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Surging at idleI have a code pulled for P0171 but it read as bank 1 reading lean... that was last night. tonight is when the surging started... Any ideas?
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Definition of Diagnostic Trouble Code P1506
Audi:
Closed Throttle Position Switch Does Not Open/Short to Ground
BMW:
Idle-Speed Control Valve Opening Solenoid Control Circuit Signal High
Ford:
Idle Air Control Overspeed Error (see P0507)
Jaguar:
Idle Air Control System RPM Lower Than Expected - B Bank
Kia:
IAC Valve Opening Coil Voltage High
Lincoln:
Idle Air Control Overspeed Error (see P0507)
Mazda:
Idle Air Control Overspeed Error
Mercury:
Idle Air Control Overspeed Error (see P0507)
Porsche:
Throttle Jacking Unit Lower Mechanical Stop, Signal Implausible
Volkswagen:
Closed Throttle Position Switch Does Not Open/Short to Ground
Volvo:
IAC Valve Opening Signal
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Definition of Diagnostic Trouble Code P1151
Audi:
Bank1, Long Term Fuel Trim, Range 1 Leanness Lower Limit Exceeded
BMW:
Oxygen Sensor Heater Circuit Signal Intermittent (Bank 2 Sensor 1)
Ford:
Lack Of Heated Oxygen Sensor Bank 2 Sensor 1 Switches - Sensor Indicates Lean
Jaguar:
Lack of H02S-21 switch, sensor indicates lean
Land Rover:
Lambda control limit bank 2.Implausible signal/condition
Lincoln:
Lack Of Heated Oxygen Sensor Bank 2 Sensor 1 Switches - Sensor Indicates Lean
Mazda:
Lack Of Heated Oxygen Sensor Bank 2 Sensor 1 Switches - Sensor Indicates Lean
Mercury:
Lack Of Heated Oxygen Sensor Bank 2 Sensor 1 Switches - Sensor Indicates Lean
Subaru:
HO2S-12 Heater Circuit High Input
Toyota:
Coolant Path Clog Up for Coolant Heat Storage System
Volkswagen:
Bank1, Long Term Fuel Trim, Range 1 Leanness Lower Limit Exceeded
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Definition of Diagnostic Trouble Code P0302
Category:
Powertrain
Definition:
Cylinder 2 Misfire DetectedNote: This definition of P0302 is applied to all manufacturers
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Definition of Diagnostic Trouble Code P0171
Category:
Powertrain
Definition:
System Too Lean Bank 1Note: This definition of P0171 is applied to all manufacturers
Lean condition bank 1 refers to the computers interpretation of information delivered by the o2 sensor for bank 1. Possible causes are many. First look at the sensor readings. You should see a fluctuation of voltage readings. If the sensor is not fluctuating it should set another code with it. The readings should be .05 v to about .455 volts normally. If the readings are lean then look at the fuel trims. They will likely be nowhere near 0. When the engine is right, the trims may go positive 3 to negative 3. If your short term fuel trim is say +18 and the long term fuel trim is say +20 at idle then try runnung the engine at a steady 1600 rpm and wait a minute till the readings level out. If they approach 0 then look for a vacuum leak. Let the engine idle and use choke cleaner spray to find the leak. Spray suspect areas and watch for changes in fuel trims.
code p0171 refers to system too lean bank 1 causes---intake exhaust leak--- AIR system----MAF?VAF sensor fuel pressure/ pump injectors HO2S code p0174 refers to System to lean bank 2 causes the same except Maf and vaf are not mentioned and hose connections are added code p0316 refers to misfire detected at star up first 1000 revs causes ---engine mechanicval fault---wiring---ignition/ fuel system--injector code p0430 refers to cat convertersystem bank 2-- effeciency below threshold causes ----cat converter--- wiring ----HO2S. Personally I would chewck the cat converter first as if it is blocking the exhaust system the ret of the sensors will have irregular readings.
You have big problems here, I suggest you go to the provided links and read about these fault codes and then hire a good technician. Ford P0171 P0174 Lean Codes
i have a feeling the problem is not the sensors, they are reading lean indicates that air is getting into the engine around monitored system, basically a vacuum leak, which causes surging, also get a real time engine monitor not just a code scanner, some even have snapshot capabilities that will freeze the readings when something abnormal happens, just don't go replacing parts without knowing why
P0300 Random/Multiple Cylinder Misfire Detected P0171 System too Lean (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
i could only find the 2 codes for you
try here www.engine-light-help.com
what kind of shape are your plug wires in ?
If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.
Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.
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