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1588A105 Upstream Oxygen Sensor,Exhaust Front Lambda O2 Sensor

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Thread‑mounted on exhaust manifold ahead of catalytic converter, this zirconia‑type upstream oxygen sensor is critical electronic part for engine fuel injection system. It samples exhaust oxygen content and sends feedback signal to ECU. ECU adjusts fuel injection pulse width to maintain optimal air‑fuel mixture. Engine startup performance, idle stability, acceleration response and fuel consumption are directly influenced by sensor working condition.
Long‑term high‑temperature exhaust impact, carbon soot accumulation and internal component aging will result in signal drift. Typical failure symptoms: MIL check‑engine light on dashboard, shaking rough idle, increased fuel consumption, black exhaust smoke, insufficient power output and related OBD fault codes stored. Many repair shops repeatedly test ignition parts and injectors, ignoring defective oxygen sensor which causes repeated failure.
This replacement oxygen sensor replicates OEM thread specification, signal output characteristic and complete sealing gasket. High‑temperature resistant probe adapts harsh exhaust manifold environment. Apply anti‑seize compound to thread before installation. Suitable for Mitsubishi Pajero SUV engine fuel‑system overhaul assignments.