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Symptoms include hard starting, stalling, poor fuel economy, hesitation under load, and fault codes P0190-P0194. Some vehicles will enter limp mode if fuel rail pressure cannot be confirmed by the ECU.

A fuel pressure sensor monitors and reports fuel rail pressure to the ECU. A fuel pressure regulator controls and maintains fuel pressure at the correct level. They work together - a faulty sensor gives incorrect readings while a faulty regulator causes actual pressure problems.

Common causes include contaminated fuel, carbon buildup on the injector tip, worn internal seals, and general wear over high mileage. Symptoms of a failing injector include rough idle, misfires on one cylinder, fuel smell, and poor fuel economy.