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6 codes, knock sensor included


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Idle was very low today, CEL and Check VSC are on the dash of my 98. Read codes, came up with six, including a Current and Pending code for system too lean bank 1, as well as knock sensor bank one. Bank one injectors just replaced less than 100 miles ago. Pictures attached show data stream data, fuel trims do indicate that it is running lean, which could be my knock.

Codes were:

P0171 - System Too Lean Bank 1 (Current)

P0171 - System Too Lean Bank 1 (Pending)

P1120 - Accelerator Pedal Position Sensor Circuit Malfunction (Current)

P0325 - Knock Sensor 1 Circuit Bank 1 or Single Sensor (Current)

P0110 - Intake Air Temperature Sensor 1 Circuit (Current)

P0100 - Mass or Volume Air Flow A Circuit (Current)

All of these codes came on at the same time, CEL was not on nor were there any stored codes before injector replacement. I believe they may have had an effect on the VSC system, and caused some sensors to go wack as well as the new injectors not being broken in, resulting in the knock sensor.

Data stream attached below if any data from it helps.

F82E932F-42A0-42C4-ADD0-16F1CD4ADCA5.thumb.jpeg.1eef464580aeed768c6d70f8b5ff3ecf.jpeg06EB174E-964B-44AA-9548-0394D73A2319.thumb.jpeg.593952df740816b1c18d93ac57a7e1bd.jpeg51C5448A-849D-439E-85FC-E1ADD1AFC8E3.thumb.jpeg.5fc59a4735f3c4f13b0605fe672ba325.jpegF085701D-27F2-473E-A481-69D679A54121.thumb.jpeg.22687fd021f7cc3a2dd55652a01bf083.jpegDF4E4132-3755-48F4-B5E3-C48A48AC94DA.thumb.jpeg.339e618ffd84514dd3f365a22f461248.jpegBD8AB2C6-69F3-4872-B006-826B3B5C3265.jpeg.13812aec58a0ef7bd14f25df112205c2.jpeg

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  • 2 weeks later...

Coming back to this I may have reached a conclusion. IAT and MAF are the same sensor. I would assume that they are bad and cause running lean, which causes the knock sensor. My only problem is accelerator pedal position circuit. Causing low idle and not sure how to fix that.

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