Question about 2005 Mazda MAZDA3

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Mazda3,2005 trouble code p2177 system too lean off idle bank1

Scan tool say too lean off idle bank1

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Check for correct fuel pressure.
If fuel pressure is low could be bad fuel filter, fuel regulator or pump.
If fuel pressure is correct could be bad MAF sensor, injectors, O2 sensor or vacuum leak on inlet manifold.

Posted on Apr 13, 2015

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Posted on Jan 02, 2017

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Check engine light is on and i am getting code p2177 system too lean off idle bank 1 how can i fix this can someone help thank you.


code p 2177 has to reference reasons for fault
1 is system too lean off idle bank 1===causes ---fuel pressure ---injectors --- intake leak
2 is adaptive heating sensor ( HO2S) control, bank 1---signal high===causes--wiring---short to positive ---HO2S--- ECM
the question was the engine operating correctly before the light came on and after the light came on--- if so that would eliminate the pressure and injectors
that would leave replacing the HO2S sensor which is the sensor in the exhaust manifold before the cat converter
make sure you use the correct sensor replacing tool as anything else will damage the wires and connections

Dec 20, 2015 | Cars & Trucks

3 Answers

Failed emission test, codeP2177,P2187,P2188 & P2195 what are these code


What make , model , an year vehicle ? These codes can mean different thing's for different make vehicles

Oct 08, 2015 | Cars & Trucks

1 Answer

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

1 Answer

I have a mazda 3 05 and code p2177 came up


Carlos, this code means that the fuel mixture is to lean during "off idle" [aka just above idle] operating conditions. Proper diagnosis requires a high amount of skill, experience and a real computer scan tool, not just a code reader. That said, the most common causes of this code are either bad oxygen sensor(s) or a bad MAF [Mass Air Flow] sensor. Once a vehicle gets above 70,000 miles on the odometer, the oxygen sensors start to slow down and fail. Often this happens without setting a fault code for a bad sensor. If your car has 100,000 miles or more on it, change the sensors regardless. Replacement of the oxygens sensors will improve your fuel mileage. Another common cause of this code is a vacuum leak.
PS In the future, always state the engine size for your car, as it came with either a 2.0 or 2.3 liter engine.

Aug 24, 2014 | Cars & Trucks

1 Answer

Trouble code p0402 is coming up on the scan tool, what is the problem?


On a domestic car using a scan tool, the trouble code p0440 is an Evaporative Emission Control System Malfunction. It can mean the gas cap is not installed or working right, the purge solenoid has failed, or the canister is plugged and not working right.

Oct 28, 2012 | 1996 Lincoln Town Car

2 Answers

P2197 p2187 p2177 p2195 p2179 p2189


P2197 - Oxygen Sensor Signal Biased/Stuck Lean Bank 2 Sensor 1
P2187 - System Too Lean At Idle Bank 1
P2177 - System Too Lean Off Idle Bank 1
P2195 - Oxygen Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1
P2179 - System Too Lean Off Idle Bank 2

I am not sure what your Mazda is, but from the sounds of it, both of your Oxygen Sensors are shot. Replace them both, or check for vacuum leaks. It may be a good time to inspect and replace the PCV Valve and PCV Valve hose, too.

Mar 12, 2011 | Mazda MAZDA6 Cars & Trucks

2 Answers

Want to know what a code PO171 means(system too lean bank1).car idles rough and blows black smoke when you rev it up.and is also misfiring.?


If the car is thinking its lean, but its blowing black smoke then it sounds like its confused. Sounds like the o2 sensor is bad. How does it run when its cold?

Feb 12, 2011 | Pontiac Sunfire Cars & Trucks

1 Answer

2003 GMC Sierra Has recently developed rough idle/lope at idle which sometimes goes away. Runs fine otherwise. Scan codes-Lean condition bank1 and bank2. Random misfires on all cylinders. Fuel pressure...


You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach

You learn the vehicles Systems,Test,then Replace,if you have a failed component.

Work on the Misfire Issues.
Then you lean O2 Codes will go away.

Not a the plugs.

Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors

Nov 24, 2010 | 2003 GMC Sierra 1500

2 Answers

1998 Ford Explorer v- 6 OHV Check engine light with code for too lean both banks 02 sensor. Have replced oxygen sensors four times. Have replaced muliple vacum lines including PCV hose. Have cleaned mass...


OK. Since you have had so much trouble lets check the dealer for an updated software calibration for the PCM (power train control module). Once we're sure there is no "fix" here lets talk about "lean" engine conditions. Lean means one of two things are wrong with the air fuel mixture (ideally 14.7 parts air to 1 part fuel). 1. Too much air -or- 2. Not enough fuel. If you access to a scan tool we need to look at fuel trims. With the engine warm look at this data on the scan tool. You have a "bank 1" and "bank 2" fuel trim data. Additionally, each bank has a long term and a short term value. With the Engine hot and at idle add the LT and ST trim value for bank1 and write it down...do the same for bank2. Repeat this step, for EACH bank with engine at 2500 RPM in park (hold at 2500 for at least 30 seconds so trims update). Now, you have the total trim values for each bank at idle and at 2500 RPM. What should the values be? Total trim +/- 5 is good, +/- 10 borderline any thing greater is code setting territory. If trim numbers are high at idle and in range at 2500 rpm you have a vacum leak behind the mass air flow sensor. Or a faulty MAF. Pay particular attention to the air inlet hose clamps behind (between MAF and engine) the MAF. Also use ford parts only.

Nov 14, 2009 | 1998 Ford Explorer

1 Answer

ERROR CODES


The following are generic OBD II codes so your Sabb may not conform:
P0507=Idle Control System RPM High
P2187=Sys Too Lean at Idle Bank1 

Oct 06, 2008 | 2004 Saab 9-3

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