P0171 on honda accord 2006
#1
P0171 on honda accord 2006
Hi,
I noticed some driveability problems on my accord (4-cylinders - Automatic Transmission).
1. When I get to a streetlight or have to stop or slow down to a near stop, the engine goes off and I have to restart the car.
2. When i start the car and engage drive or reverse, the engine goes off when i step on the accelerator.
3. When I rev the car on park/neutral all is normal but the engine goes off when I remove my foot from the accelerator
This has been happening for a while now and the CEL comes up with P0420-Catalyst System Efficiency Below Threshold (Bank 1). I kept on clearing the code.
A couple of days ago, the check engine light came ON. I did a scan and came up with the code P0171-System Too Lean (Bank 1). There is also a pending code P0420-Catalyst System Efficiency Below Threshold (Bank 1).
I did a real time monitoring with my scan tool and observed that the Short term fuel trim varies from 20-45%. The Long Term Fuel Trim is also greater than 20% which explains the P0171 code. Also, this lean condition increases as the engine speed (RPM) drops.
I have done some research on P0171 and any of the following can trigger the code: bad injector, vacuum leaks, dirty fuel filter, weak fuel pump, dirty MAF sensor, bad fuel pressure regulator, bad fuel feed line, faulty O2 sensor etc.
I am hoping that someone would be able to point me in the right direction using the symptoms I have noticed in the driveability particularly the engine going off.
Any help/suggestions will be greatly appreciated.
Thank you in advance.
I noticed some driveability problems on my accord (4-cylinders - Automatic Transmission).
1. When I get to a streetlight or have to stop or slow down to a near stop, the engine goes off and I have to restart the car.
2. When i start the car and engage drive or reverse, the engine goes off when i step on the accelerator.
3. When I rev the car on park/neutral all is normal but the engine goes off when I remove my foot from the accelerator
This has been happening for a while now and the CEL comes up with P0420-Catalyst System Efficiency Below Threshold (Bank 1). I kept on clearing the code.
A couple of days ago, the check engine light came ON. I did a scan and came up with the code P0171-System Too Lean (Bank 1). There is also a pending code P0420-Catalyst System Efficiency Below Threshold (Bank 1).
I did a real time monitoring with my scan tool and observed that the Short term fuel trim varies from 20-45%. The Long Term Fuel Trim is also greater than 20% which explains the P0171 code. Also, this lean condition increases as the engine speed (RPM) drops.
I have done some research on P0171 and any of the following can trigger the code: bad injector, vacuum leaks, dirty fuel filter, weak fuel pump, dirty MAF sensor, bad fuel pressure regulator, bad fuel feed line, faulty O2 sensor etc.
I am hoping that someone would be able to point me in the right direction using the symptoms I have noticed in the driveability particularly the engine going off.
Any help/suggestions will be greatly appreciated.
Thank you in advance.
#2
Honda-Tech Member
Re: P0171 on honda accord 2006
Hi,
I noticed some driveability problems on my accord (4-cylinders - Automatic Transmission).
1. When I get to a streetlight or have to stop or slow down to a near stop, the engine goes off and I have to restart the car.
2. When i start the car and engage drive or reverse, the engine goes off when i step on the accelerator.
3. When I rev the car on park/neutral all is normal but the engine goes off when I remove my foot from the accelerator
This has been happening for a while now and the CEL comes up with P0420-Catalyst System Efficiency Below Threshold (Bank 1). I kept on clearing the code.
A couple of days ago, the check engine light came ON. I did a scan and came up with the code P0171-System Too Lean (Bank 1). There is also a pending code P0420-Catalyst System Efficiency Below Threshold (Bank 1).
I did a real time monitoring with my scan tool and observed that the Short term fuel trim varies from 20-45%. The Long Term Fuel Trim is also greater than 20% which explains the P0171 code. Also, this lean condition increases as the engine speed (RPM) drops.
I have done some research on P0171 and any of the following can trigger the code: bad injector, vacuum leaks, dirty fuel filter, weak fuel pump, dirty MAF sensor, bad fuel pressure regulator, bad fuel feed line, faulty O2 sensor etc.
I am hoping that someone would be able to point me in the right direction using the symptoms I have noticed in the driveability particularly the engine going off.
Any help/suggestions will be greatly appreciated.
Thank you in advance.
I noticed some driveability problems on my accord (4-cylinders - Automatic Transmission).
1. When I get to a streetlight or have to stop or slow down to a near stop, the engine goes off and I have to restart the car.
2. When i start the car and engage drive or reverse, the engine goes off when i step on the accelerator.
3. When I rev the car on park/neutral all is normal but the engine goes off when I remove my foot from the accelerator
This has been happening for a while now and the CEL comes up with P0420-Catalyst System Efficiency Below Threshold (Bank 1). I kept on clearing the code.
A couple of days ago, the check engine light came ON. I did a scan and came up with the code P0171-System Too Lean (Bank 1). There is also a pending code P0420-Catalyst System Efficiency Below Threshold (Bank 1).
I did a real time monitoring with my scan tool and observed that the Short term fuel trim varies from 20-45%. The Long Term Fuel Trim is also greater than 20% which explains the P0171 code. Also, this lean condition increases as the engine speed (RPM) drops.
I have done some research on P0171 and any of the following can trigger the code: bad injector, vacuum leaks, dirty fuel filter, weak fuel pump, dirty MAF sensor, bad fuel pressure regulator, bad fuel feed line, faulty O2 sensor etc.
I am hoping that someone would be able to point me in the right direction using the symptoms I have noticed in the driveability particularly the engine going off.
Any help/suggestions will be greatly appreciated.
Thank you in advance.
#3
Re: P0171 on honda accord 2006
@ Justinsbg. I just had a similar problem, and your post pointed me in the right direction. I found that I had accidentally knocked out the device that is plugged into the air intake tube while replacing the VTEC oil pressure sensor. fuel trim went from 49% down to 1.6%. Thank you.
Last edited by Kdrane243; 08-16-2012 at 09:17 PM. Reason: added text
#4
Re: P0171 on honda accord 2006
Thanks for the replies.
I discovered that the air flow tube between the MAF sensor and the throttle position sensor was torn and unmetered air was entering from this leak. I replaced this and the P0171 code has not come since then. . The engine has stopped going off at low speeds. I am still having the P0420 code though
I discovered that the air flow tube between the MAF sensor and the throttle position sensor was torn and unmetered air was entering from this leak. I replaced this and the P0171 code has not come since then. . The engine has stopped going off at low speeds. I am still having the P0420 code though
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