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lean oxygen sensor fuel

  1. Error Codes P1128 P0131 Oxygen Sensor Lean

    New Beetle
    This is a '99 2.0L 5sp with 87,000 mi. Full 40k tune up at 81k replaced spark plugs, plug wires & brake booster to manifold vac hose. Check Engine: P1128 LT Fuel Trim Too Lean P0131 O2 Circuit Lo Volt Bank 1, Sensor 1 Is it likely it needs a before Cat Converter O2 Sensor? Do I understand the...