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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.

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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....
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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?
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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 ...
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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 ...
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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 ...
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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 ...
Flamenco77's user avatar
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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. ...
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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, ...
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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 ...
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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 ...
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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 ...
James Doyle's user avatar
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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 ...
LegeekX3's user avatar
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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 ...
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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 ...
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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 %. ...
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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 ...
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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 ...
Cognitive Hazard's user avatar
3 votes
1 answer
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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 ...
Ronnie3945's user avatar
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2 answers
2k 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....
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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 ...
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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 ...
MickeyD2556's user avatar
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1 answer
4k 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 ...
Florent 's user avatar
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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 ...
Florent 's user avatar
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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 ...
William9's user avatar
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1 answer
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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 ...
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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 ...
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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 ...
user12041's user avatar
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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 ...
Penelope Castin's user avatar
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 ...
TrippedStackers's user avatar
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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 ...
TrippedStackers's user avatar
8 votes
2 answers
51k 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 ...
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