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o2s signal stays below center (lean) oxygen sensor signal input indicates lean air/fuel ratio condition during engine operation
Wiki User
∙ 16y ago
A code 51 on a 1994 Plymouth Voyager typically indicates an issue with the engine's oxygen sensor. This sensor measures the amount of oxygen in the exhaust gases to help the engine control unit adjust the air-fuel mixture for optimal performance. It is recommended to have the oxygen sensor and related components checked and potentially replaced by a qualified mechanic.
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