Rick's Free Auto Repair Advice

Posts Tagged: low power

How to fix Code P0420

What is code P0420 Catalyst System Efficiency Below Threshold When attach a trouble code reader and come up with a P0420, your first assumption may be that you need a new catalytic converter, simply because the words catalytic converter are mentioned in the code. After the tests you may indeed discover that the catalytic converter is bad. But first you have to understand how the air/fuel and emissions systems work. How the air and fuel mixtures are calculated The powertrain control module (PCM) receives inputs from the engine coolant temp … Read More

Infinity QX56 Low Power

Fix low power on Infinity QX56 Infinity QX56 owners are experiencing a problem with low power under heavy acceleration. You may also have a “Check Engine” light on. The problem is most likely a fuel delivery problem caused by a bum fuel pump To diagnose the problem you’ll have to attach a fuel pressure gauge and conduct a stall test in your garage. To do that, set the parking brake and start the engine. Put your foot on the brake pedal and the transmission in gear. Then give it gas. … Read More

P0340, P0344, P0172, P0175 – Ford

Fix trouble codes P0340, P0344, P0172, P0175 on Ford If you encounter any of these codes P0340, P0344, P0172, P0175 – Ford, this may be the fix for you. Ford has issued a TSB (#06-13-9) for 2005-06 Expeditions and Navigator vehicles. The fix involves updating the PCM software. The symptoms are as follows: Hard starting requiring multiple restart attempts after the vehicle has been driven and shut down (hot soak). The “check engine” light is on and any or all of the above codes are stored in the PCM. You … Read More


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