San Jose Auto Repair

An exhaust leak sounds like a noise problem, but it can turn into a check engine light problem pretty quickly. Modern engines rely on oxygen sensors to measure what is happening in the exhaust stream, and those sensors assume the exhaust is sealed. When outside air sneaks in, the readings can skew, and the computer may think the engine is running lean or that the catalytic converter isn't doing its job. That is why a small leak can set off a warning even when the car still feels normal. How Exhaust Leaks Confuse Oxygen Sensors Oxygen sensors measure oxygen content in the exhaust, then the engine computer adjusts fuel delivery based on that feedback. If there is a leak ahead of a sensor, fresh air can get pulled into the exhaust flow, especially during deceleration or at idle. That added oxygen makes the sensor report a lean condition, even if the engine itself is not actually running lean. The computer responds by adding fuel, and that can create more problems t ... read more

Some roads make every car feel a little busy. But if your vehicle feels nervous, floaty, or unpredictable anytime the pavement gets rough, that’s different. You might notice it on patched asphalt, bridge joints, or those wavy sections of freeway that make the car drift even when you are holding the steering wheel steady. An unstable feel on uneven roads usually comes from a grip-and-control issue. Tires, alignment, and suspension all play a role. The good news is that this problem almost always leaves clues you can follow. Why Uneven Pavement Exposes Weak Points On a smooth road, your tires stay consistently loaded, and the suspension only has to manage small movements. Uneven surfaces constantly change the load on each tire. The suspension has to react quickly, and the steering system has to keep the wheels tracking straight while the tires hit bumps at slightly different times. If a component is worn, the car can lose composure. The tires may not stay plant ... read more