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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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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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487 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 %. ...
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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 ...
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1answer
124 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 ...
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1answer
907 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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1answer
1k 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 ...
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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 ...
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1answer
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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 ...
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1answer
2k 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 ...
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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 ...
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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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1answer
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 ...
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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 ...
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1answer
3k views

2001 Hyundai Sonata System too lean

I own a 2001 Hyndai 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 ...
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423 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 ...
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'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 ...