Question about 2002 Nissan Sentra

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Poor idle, power loss off idle then takes off if you give it more throttle like a quarter more pedal, engine code says bank 2 is to lean

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You need a new MAF (mass air flow sensor or air flow meter as its called). and you will also need a new air filter, since you most likely used aftermarket one and that's what killed that MAF sensor/meter. Aftermarket air filters dont sit right in the box and are not oil soaked, which helps to catch any debris and dirt coming into your engine. Replace you air filter with Nissan filter and install a new MAF/air flow meter. If your air box is dirty, clean that out too. MAF sensor will run you about $500 and the air filter about $17. Common problem on a Sentra if you are not using Nissan air filter.

Posted on Aug 03, 2008

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Keeps throwing up trouble codes p1506,p1151,p0302,p0171


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

Jun 17, 2015 | Cars & Trucks

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Rough engine idle and Lean DTC codes caused by split air intake


Check the 5" wide rubber air intake hose at the convolutes for splits that allow unmetered air into the engine. When this happens, the MAF sensor does not know this air is flowing into the engine, so it leans out the mixture generating DTC codes for Lean, Bank 1 & Bank 2.<br /><br />Use duct tape for a temporary fix and buy a new air intak hose. This hose runs from air cleaner box to engine throttle body.

on Oct 30, 2010 | Mazda MAZDA6 Cars & Trucks

1 Answer

Codes 171 174 for 2005 suzuki verona l6 2.5 litre engine


ever give it a tune up this in the last 9 years.????
ah the 2.5, i have one too, the 2.5. and know it well.
i have the real FSM on this engine.
p0171 and p0174 (the zero counts) 02 reads lean, and LTFT slams to rail errors.

The FSM is clear, both banks are lean. BOTH is a key fact.
lean has many reasons, a mech , never just guesses why, there are 10 causes. or more.
what I do is get the engine fully hot.
Using any real scan tool (yes, you need a scan tool to fix all modern cars):
1: is the ECT showing over 180f +coolant temp? sure.
2: is the engine holding Closed loop at idle? no, fix that first.
3: i see LTFT , is trying to correct gloss lean. (bingo)
LTFT = long term fuel trim,
4: EGR cleaned, Does it leak.?
5: is the MAF dirty, the MAF sensor can go weak dirty and can cause low fueling , in FACT the MAF is the top fuel rate, device on this engine. 02 sensors are fine trim.
6: intake air leaks. any leaks cause lean.
7: low fuel pressure. for any reasons.

you posted only 2 codes.
and no driving symptoms, so ....????
loss of power WOT? wide open throttle?

the MAF is here.
http://www.fixkick.com/engine/2.5L%202004%20Tracker/25L-2004-engine.pdf

page 34 , see it in the TB?
suzuki dont sell it,
take it off, and gently from 12inches away (never dead close at straw tip)
spray CRC maf cleaner on it , let it sit 1min, repeat and put it back.
i thne look for intake air leaks. under the TB side.
TB to the intake, and the whole behind TB side.
ok no leaks there.
i then check fuel pressure with a REAL guage.

that is just a start. we can take this to any conclusion
based on all tests. so far. then more tests. if need be.
this is called DIAGNOSIS.

Sep 20, 2014 | 2005 Suzuki Verona EX

1 Answer

Engine trouble code 174 bank 2


Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6 and V8 engines, Bank 2 is normally the side of the engine that doesn't have cylinder #1.

This problem usually indicates that there's a vacuum leak somewhere on the engine.

Inspect all the vacuum hoses on the engine for any that are disconnected or leaking. If none are found, then start the engine and while it's idling take an aerosol can throttle body cleaner and spray this around the intake area of the engine. If there are any vacuum leaks, the engine idle speed will change when the cleaner is drawn into the engine at the leak.

Nov 11, 2013 | 2002 Suzuki Vitara

1 Answer

To start, I coded my engine and got P0171 - Bank 1 System too Lean. From a stop, when I start out I have a sputter. I push the pedal more & there is no engine rev, and no acceleration. Then the engine...


i have had that problem before its most likely a dirty throttle body or a bad throttle position sensor or air idle control sensor some times cleaning the sensors will work before changing them

Aug 10, 2013 | 2000 Chevrolet Prizm

1 Answer

Check engine light is on. Does replacing the oil filter fix the problem? The codes are: P171, P174


very Unlikely this will have any affect. sounds more like an air leak to me.
You will find all codes available at http://www.bluejag.co.uk/decode.php



Fault Code:- P0171 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 1 combustion too lean

Action of ECM:- ECM Default:- Bank 1 catalyst warm-up ignition ****** inhibited- Bank 1 closed loop fuel metering inhibited- Canister purge inhibited- Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature> 82 °C (180 °F) Idle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (1/1, 1/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor
Fault Code:- P0174 Indicates a Power-train fault


The fault is generally due to a problem in the Emission Management (Fuel or Air) area


Fault Description: Bank 2 combustion too lean

Action of ECM:- ECM Default:- Bank 2 catalyst warm-up ignition ****** inhibited- Bank 2 closed loop fuel metering inhibited- Canister purge inhibited- Maximum engine speed reduced


After clearing the DTC, complete the Start engine and bring to normal operating temperature> 82 °C (180 °F) Idle for 10 minutes
Check for a reoccurrence of fault DTC.


Possible Fault:- Engine misfire Air intake leak between MAF Sensor and throttle Fuel filter / system restriction Fuel injector restriction Low fuel pump output HO2 Sensor(s) (2/1, 2/2) harness wiring condition fault Exhaust leak (before catalyst) ECM receiving incorrect signal from one or more of the following components: ECT Sensor, MAF Sensor, IAT Sensor, TP Sensor

Sep 09, 2011 | 2004 Jaguar X-Type

1 Answer

2007 Hyundai Entourage codes P2187, PP0174,P2189,P2195,P2270,P2272


I've come across these codes before. In almost every case there was an air leak in the intake air hose (hose between the engine air filter & the throttle body). Inspect this hose & tubes attached to it. This is especially true when the lean code includes the comment 'at idle'
P2187 - System too lean at idle Bank 1
P0174 - System too lean Bank 2
P2189 - System too lean at idle Bank 2
P2195 = HO2S Signal Biased/Stuck Lean (Bank 1 Sensor 1)
P2270 = HO2S Signal Stuck Lean (Bank 1 Sensor 2)
P2272 = HO2S Signal Stuck Lean (Bank 2 Sensor 2)

P2187 & P2189 = In order to provide the best possible combination of drivability, fuel economy and emission control, the PCM uses a closed loop air/fuel metering system. The PCM monitors the HO2S signal voltage and adjusts fuel delivery based in closed loop fuel control. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. The ideal fuel trim value is around 0%. The PCM will add fuel when the HO2S signal is indicating a lean condition. Additional fuel is indicated by fuel trim values that are above 0%. The PCM will reduce fuel when the HO2S signal is indicating a rich condition. Reduction in fuel is indicated by fuel trim values that are below 0%. The DTC relevant to fuel trim will be set when the amount reaches excessive levels because of a lean or rich condition

Aug 31, 2011 | 2008 Hyundai Entourage

1 Answer

P0068 on a 2006 Dodge Ram 1500 SLT. Rough "hunting" for idle. Momentary lag/loss of power from a stop. Random RPM changes while at a constant speed. Sometimes it feels like it drops out of gear...


P0068 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of power
- Engine rough idle Possible causes - Large vacuum leak
- Leaking air duct system
- Mass Air Flow (MAF) poor electrcial connection
- Manifold Absolute Pressure (MAP) poor electrcial connection
- Faulty Mass Air Flow (MAF) sensor
- Faulty Manifold Absolute Pressure (MAP) sensor
- TP sensor not seated properly.
- Faulty Throttle Position (TP) sensor.
- Dirty throttle body
When is the code detected? The Powertrain Control Module (PCM) monitors operation rationality check by comparing sensed throttle position to mass air flow readings
P0068 DODGE Description The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

Jul 10, 2011 | Dodge Ram 1500 Cars & Trucks

3 Answers

Getting a code of misfire on cylinder 2, Bank 1 and lean code


Have you tried replacing the throttle positioning sensor?

Nov 09, 2009 | 2001 Ford Taurus

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