Order Chevrolet HHR Oxygen Sensor. Explore Chevrolet HHR O2 sensor cleaner & Chevrolet HHR O2 sensor socket. Shop Chevrolet HHR Oxygen sensor socket. Maintaining optimal performance in your Chevrolet HHR hinges on the health of your O2 sensors, which are pivotal for engine efficiency and emission control. To extend their lifespan, avoid using fuel additives that can coat the sensor, and ensure your vehicle undergoes regular maintenance to prevent excess carbon buildup. Signs that your O2 sensors may require replacement include a check engine light, poor fuel economy, or rough engine idle. Choosing the correct replacement involves selecting from upstream or downstream sensors, each calibrated to your HHR's specific needs. Opt for high-quality materials and consider OEM parts for a seamless installation, ensuring your ride continues to meet emissions standards and retains its fuel efficiency, essential for an eco-conscious online market.