Question about 1996 Dodge Dakota

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1996 dodge dakota black smoke, engine running horrible getting P0171 code?

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  • Jim p Aug 01, 2010

    I went to autozone and its the device they used. That was the only code that came up. another site told me it could be the fuel pump pressure. Is there anyway to test the o2 sensor ?

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It sounds like your engine is running very rich yet the computer thinks it's lean. P0171 is a lean code for bank 1 (the side of the engine with cylinder #1) Pretty much the only causes could be a large exhaust leak, bad o2 sensor or bad computer. Is the p0171 the only code?

Posted on Jul 31, 2010

  • Christopher Foulkes Aug 02, 2010

    High fuel pressure can certainly cause a rich condition, but if the oxygen sensor was functioning properly it would see it was running rich and set a rich running code. Since it set a lean running code the oxygen sensor is reading inaccurately, telling the computer the engine is running lean when it's actually running pig rich. The computer takes this data and increases the injector pulse width dumping more fuel in causing it to run rich. If you had access to a scanner you could see the data stream and make note of the oxygen sensor voltage. It should switch above and below .500 volts regularly, it may be stuck lean (below .500 volts). Based on what your saying and the limited diagnostic tools available to you i would start by replacing the oxygen sensor on bank 1.

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