Questions tagged [p0171]
Code P0171 - System Too Lean. This code indicates an oxygen sensor has detected too much oxygen in the exhaust. Part of the P01xx - `Fuel and Air Metering` family of codes.
32 questions
0
votes
1
answer
38
views
Where is the MAF sensor on a 2004 Subaru Forester XS?
I pulled a P0171 OBD-II diagnostic code (bank 1 fuel trim too lean) after getting a check engine light a couple weeks ago. The information I found tells me that the most likely solution is to clean or ...
0
votes
0
answers
15
views
Toyota 4runner 1998 AT 5vz fe 143000km
After got my injectors changed to correct misfiring condition, I am now running lean and cannot find the trouble since 2 weeks now.
My OSB1S1 fluctuate between .6 and .3 V and my OSB1S2 is steady at 0....
- 1
0
votes
0
answers
81
views
Flashing overdrive light 2002 ford escape
2002 ford escape xlt-flashing overdrive light comes on after short period of driving. Comes on when approaching 50 mph? Or so...how do I fix it?
- 1
1
vote
1
answer
750
views
How to fix Check engine error P0171 on VW Tiguan?
Took the vehicle for service after the usual 7000km.Parts that were changed during the service are Spark plugs, engine oil type 5W-40, Oil filter, Air cabin filter and Air filter. Two days later l got ...
- 111
0
votes
1
answer
137
views
What do you think of these spark plugs?
Still trying to diagnose an erratic positive fuel trims. Next step will be making sure that the lean condition i have is caused by less fuel delivered or weak spark not a vacuum leak. I pulled spark ...
- 31
1
vote
1
answer
438
views
Engine leaning more after refueling?
Corolla with intermittent code saying System Too Lean (Bank 1) P0171 after refueling. First i noticed that there is slightly stronger fumes when i refuel then the code will illuminate ( Code not ...
- 11
0
votes
0
answers
484
views
Is this Purge valve ticking sound normal? Youtube video
It is 2001 Corolla 1.8 engine. I'm still in the process of diagnosing an intermittent P0171 code. I posted a video in other post and user Carguy was very helpful and he mentioned that this ticking ...
- 31
0
votes
1
answer
134
views
What does the fluctuating needle means in this vacuum test? Video uploaded to youtube
I would appreciate any opinions on this vacuum test. Car is corolla 2001 1.8 engine with the code p0171. While the needle is in the normal green range, it fluctuates rapidly with very small movement. ...
- 31
0
votes
1
answer
181
views
Lowest Fuel trims achieved only in the 1200-1500 RPM range?
This car still driving me crazy. I wrote here before about getting the code P0171 and some suggested a vacuum or exhaust leak. I sprayed some flammable connector cleaner around the intake manifold, ...
- 31
1
vote
1
answer
732
views
Why my long fuel trim readings are higher than short trim ones?
My understanding of long trim vs short one is that the short trim readings will adjust the long trim after awhile right? For example my short trim readings are in the -5 to positive 7% max while the ...
- 31
1
vote
0
answers
644
views
Corolla 2001 engine 1ZZ-FE with P0171 code
I bought this car about three months ago with 180K on it and tested for codes after taking for drive test with no problems. I drove it for about 200 miles after purchase no problems except not so ...
- 31
1
vote
0
answers
403
views
Just changed catalytic converter and getting P0171 and P0430 codes
Vehicle is a 2004 Mercury Monterey, V6. Over the winter the injectors were replaced, and all 4 O2 sensors. It failed a state inspection, because the catalytic converter had been damaged, presumably ...
- 11
2
votes
2
answers
294
views
Mazda 323 / Protege 2001 power problem
Here is my name, Fabien
My friend bought a 323F 2001 with 58 000 km, it's the 1.6 DOHC engine with 98 HP ( 72 KW ). We live in France
We got a problem to make the car running great.
For now, the ...
- 21
3
votes
1
answer
4k
views
Help with P0171 code
I've been struggling with a p0171 code since I've bought my car (second hand). It's a Honda hrv 2016. I've already taken to Honda service several times. They made me change the lambda sensor, maf ...
- 31
0
votes
2
answers
14k
views
P0171 "System too lean" error in Vauxhall Corsa 2011 - comes on intermittently
I am getting an engine fault light in my Vauxhall Corsa 2011 with fault code
P0171 "System too lean"
This is not constantly on and only comes on intermittently. This caused a problem when taking it ...
- 87
1
vote
0
answers
1k
views
P0171 code with high fuel trim
I have a 2001 Toyota Corolla.
Lately it has been throwing the P0171 code (system too lean). My short term fuel trim is normal at idle. +/- 5 % at idle and long term fuel trim is high at idle +18 %.
...
0
votes
1
answer
134
views
Toyota Celica 7 VVTI 190 , P0171(too lean) and B0101(speed clock died intermittently) codes , pls help new purchase
Description below. pls help as I just bought this car.
Something interesting about the CEL, I think this info may help isolate the problem
It looks like the MAF may be new, but I will confirm that ...
4
votes
5
answers
5k
views
P0171: what to look at next, after MAF, O2 senors, fuel filter, and vacuum?
I have been chasing a P0171 on a project vehicle for quite some time now. This is a 1999 4Runner with the 5VZ V6 engine, 70K miles, naturally aspirated. For this particular model-year there was no ...
- 874
3
votes
1
answer
290
views
Vehicle not storing freeze frame data when it sets OBD P0171 code
I have an 05 Hyundai Tucson with 2.7L engine with 85,000 miles. It is setting a P0171 lean bank one code. However, both banks are operating at near the high threshold levels around 14.8%. Numerous ...
- 44
3
votes
2
answers
3k
views
PO171 trouble code at idle
My Toyota Vitz (Yaris) 2007 randomly gives PO171 (System Too Lean) when at idle. My mechanic has done following fixes so far, but problem still persists.
Replaced oxygen sensors.
Replaced fuel filter....
- 1,003
3
votes
1
answer
3k
views
Corolla gives me a P0170 code
I had an issue when sometimes my 2000 1.8L Corolla stalls if I roll in reverse. A few weeks later, I got a check engine code pointing to Bank 1 Sensor 1 as an issue. I replaced it, cleared the codes ...
- 131
2
votes
1
answer
5k
views
P0171 and P0174 in 2008 Range Rover HSE
I have a 2008 Range Rover HSE with 147,000 miles. I got a check engine light and the PID indicated catalytic converters in bank 2 were bad. I replaced the cats and then started getting P0171 and ...
- 21
7
votes
1
answer
5k
views
Fuel Trim Readings
I have a 2002 Toyota Corolla (1ZZ-FE engine) and I am trying to understand the fuel trim values I am getting in real driving conditions from my scan tool. I have P0171 code (lean condition) that comes ...
- 413
9
votes
1
answer
3k
views
P0171 and Fuel Trims
I have a 2002 Toyota Corolla (1zz-fe engine) and I am getting a P0171 code - lean condition. I am trying to make sense of my fuel trim values and I was hoping someone could help understand these ...
- 413
2
votes
0
answers
61
views
02 upstream wire harness diagram
I have a 1996 Dodge Neon 2.0 L Vin C. DTC P0171 when I went to change 02 Sensor. I saw that my upstream 02 sensor connector harness side got melted, was to close the the exhaust. Don't know how to ...
- 31
12
votes
1
answer
744
views
Are widebands known to go lazy over time?
I know narrowbands can go lazy with time, but what about widebands?
This is a sequel to the cold-start misfire mystery.
It turns out that we were looking at the wrong PID's for the front O2 sensor ...
- 39.2k
7
votes
3
answers
21k
views
Diagnosing P0171 2007 Toyota Corolla
First time poster trying to get into cars. So my 2007 Toyota Corolla (with around 89k miles) has a Check engine light that reads error code P0171 (System too lean Bank 1). I was looking that up and ...
- 181
3
votes
1
answer
4k
views
Error MIL: off Spark ignition
I checked my OBD2 sensor and it shows on DTC that message. Along with P0171 system too lean on my Mazda 3. I put in an injen intake and that was 3 years ago. The check engine light came on 3 months ...
- 31
2
votes
1
answer
3k
views
Codes like P0171, P0101
My 2001 Nissan Sentra shows a P0171 and P0101 code.
I tried to clean the sensor and the part after that (I don't know the name) and it's still showing the engine light. The sensor seems like new to ...
2
votes
1
answer
3k
views
2001 Hyundai Sonata System too lean
I own a 2001 Hyundai Sonata. Check engine light is on, and I'm getting an error code P0171, Bank 1 System too lean.
I figured I'd start eliminating problems, so when I ran an ODB check, what I got was ...
- 231
0
votes
1
answer
452
views
2001 Hyundai Sonata 2.4L hiccups badly after startup
I own a 01 Hyundai Sonata 2.4L and the error codes I get after an ODB check is p0171.
When i first start it up it's like it loses power, constantly hiccuping. So i have to press on the gas to keep it ...
- 231
8
votes
2
answers
52k
views
'Check Engine' code P0171 System Too Lean - Is it safe to drive?
My 2003 Toyota Corolla's Check Engine Light came on. I read the codes using an OBD code reader and got P0171 - System Too Lean (Bank 1) and P0133 - 02 Circuit Slow Response (Bank 1, Sensor 1). The ...
- 301