Code P0171

I ENGINES CODE P0171 AND P1309 HOW DO I FIX THESE CODES. " Code PO1309 : Misfire Monitor Failure Description : When the misfire monitor is disabled,usually due to the input signal generated by the camshaft position sensor, by sensing the passage of teeth from the camshaft position wheel. Possible Causes : PCM(powertrain control module), Mass Air Flow Sensor, Engine Coolant Temperature Sensor, Crank Shaft Position Sensor, Camshaft Position Sensor. Code PO171 : System too lean (bank 1) Description : The adaptive fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Now that we have an Idea of what the codes mean , we need to narrow them down. More than likely the problem is causing both codes to set. Keeping this in mind, lets concentrate on Code PO1309. Of the possible causes listed above I see two Sensors that may throw up a lean code. I would look at the MAF Sensor first and then the Temp Sensor. You may find that if you remove the internal Sensor from the MAF Case that some debree has collected on the thin wire. If you find debree, use a Q-Tip to clean it. DO NOT USE CHEMICALS TO CLEAN IT. If no debree is found, try a Known Good MAF Sensor. Still no fix, move on to testing the rest of the Sensors on the list till you find the problem. Keep in mind that the check engine light will have to be cleared after you have fixed the problem.

Code P0301

" I see that the code is a Cylinder 1 misfire. But what exactly is this? " It is exactly what it says. The # 1 cylinder has a misfire. this can be cause by a few different things.

1. Fouled or damaged spark plug 2. Failed spark plug wire 3. Failed coil pack 4. Failed fuel injector 5 .The " not likely " bent valve 6. Bad gas, but usually will misfire on all cylinders 7. Loss of compression ( loose plug, crack head, blown head gasket )

First thing is to remove the plug examine it, if the electrode is not rounded then place it in the wire, let it rest against the block and crank it over.. see if it sparking. This rules out the coil pack , plug and wire unless they are damaged and arching . Examine closely. If in doubt , replace them . Remember the problem is only in cylinder # 1. See if the fuel injector is firing. Check compression in relationship to # 2 cylinder. More than likely you just need a good healthy tune up. Go ahead , its probably been a while anyway. After that, treat it to a nice fresh tank of High Octane.