Hello. I've had an ongoing problem with my 2008 Corvette for over a year. I have reoccurring fault codes of P0171 and P0174, fuel trim lean on bank one and two. I have had the car to four shops and ...

Your car’s engine is an amazing feat of engineering, but it doesn’t take much to cause problems with the way it runs. Too much air, too little fuel, a field mouse making the engine bay it home, and ...

Last month we fielded a question about a fault code a reader had been trying to repair for more than a year. To recap, the Corvette in question, a ’96 model, had a recurring P0171 code, or “System Too ...

A car that hesitates when the accelerator is pressed is usually experiencing a fuel delivery problem, an ignition issue, or a ...

One of the most important measurements we make while tuning an engine is finding out what the actual balance of air and fuel was inside the engine. It doesn’t matter if we have a carburetor, port ...

Oxygen sensors detect the amount of oxygen in the exhaust. Oxygen sensors usually don’t have a replacement schedule. A bad oxygen sensor can be diagnosed with a code reader or scan tool. A car’s ...

Today’s computerised engine control systems rely on inputs from a variety of sensors to regulate engine performance, emissions and other important functions. The sensors must provide accurate ...

We earn commissions from purchases you make using links in our articles. Learn more. If your car experiences poor fuel economy, lacks power, feels sluggish, idles rough, or has an illuminated check ...

Land Rover says some of its 2010-12 LR2 models may illuminate the Check Engine light and log O2 sensor trouble codes P2097 and P2099 in computer memory. If there are no drivability symptoms associated ...

Your engine feels calm at a stoplight because a hidden idle system keeps fuel, air, and spark in balance. That quiet stability is not luck, it is the result of sensors, valves, and software working ...