1999 Volvo V70 GLT (2.4L LPT, Magneti Marelli ETM, no EGR). The car has a rough, erratic idle in park and the fuel economy keeps dropping by about 0.1 MPG every couple of days. The front and rear O₂ sensors and the MAF sensor have been replaced. The throttle body, idle air control valve, and PCV/oil trap system were all cleaned by the mechanic. The plugs and coils haven’t been replaced yet. CEL remains on, and the idle fluctuation is most noticeable once the engine’s warm. Based on these symptom

Volvo Electrical Problems - Central Electronic Module (CEM)

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