P0171 SYSTEM TOO LEAN BANK 1 IS THE CODE I GET ...

2001 Toyota Celica

Tiny

ticketin

March, 4, 2013 AT 1:52 AM

P0171 – System too Lean (Bank 1) is the code I get from the check engine light. I do not know what is causing this code. It used to come on when my fuel level went below a quarter of a tank. Now it comes on after driving about 230 miles. Someone told me the light comes on because the fuel today has more octane then when my car was built. Is this true? What are possible causes or solutions to fix this.
I purchased this car new and have been the only owner. I have kept up regular maintenance of the vehicle, the check engine light is the only issue I have with the vehicle.

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7 Answers

Tiny

saturntech9

March, 4, 2013 AT 2:08 AM

So what octane fuel do you use?Also would check actual fuel pressure and look for vacuum leaks because its setting a lean code. Also actually fuel octane back in the day was higher then it is now. Some of the older cars needed the higher octane fuel because the compression ratios were higher then they are today.

Tiny

ticketin

March, 4, 2013 AT 2:19 AM

I use 87 octane fuel. I have checked for vacuum leaks, but will check again. Could the increase in the precentage of alcohol in fuel be causing this?

Tiny

saturntech9

March, 4, 2013 AT 6:41 AM

No increased alcohol just eats seals orings etc. How did you check for vacuum leaks?The best way to check for vacuum leaks is with smoke.

Tiny

ticketin

March, 5, 2013 AT 12:57 AM

How do you check for leaks with smoke?

Tiny

saturntech9

March, 5, 2013 AT 4:49 AM

You can make a smoke machine or try using a cigar and blow smoke into the brake booster vacuum line. You have to plug off the throttle body.

Tiny

ticketin

March, 7, 2013 AT 12:58 AM

Thanks, I, m going to try that.

Tiny

saturntech9

March, 7, 2013 AT 2:35 AM

Your welcome keep me posted.

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