长城哈弗M4前氧传感器 0258006974 全新空燃比O2传感器，精准匹配

Symptoms of idle instability, obvious fuel consumption rise, or engine check light with accompanying exhaust smell typically indicate aging or failed pre-catalyst oxygen sensor. This sensor monitors exhaust oxygen content and feeds data to the ECU to precisely adjust air-fuel ratio for efficient combustion and compliant emissions. This is a new stoichiometric O2 sensor, OEM number 0258006974, perfectly fits Great Wall Haval M4. Use a dedicated socket to carefully remove old part, avoid thread damage, ensure sensor harness is secure and free of tangles. After installation, clear fault codes and road test.