On the 5 cylinder engine, weak point is the ignition coils, but you have multiple misfire so I would look for cracked coil or in the loom there is ground wire for coils, over time they are getting brittle and may cause missfire as the lpg needs strong spark its more noticeable on lpg. If I remember the engine has ecu made by denso and lambda is made by denso/ngk. They don't like bosch universal o2 sensors. What brand was the lambda?Did you replace just one or both? Lambda life span is around 150k and pi172 is indication for over fueling so it's running rich which is controlled by first lambda and map sensor and maf, before cat, the second lambda is monitoring cat efficiency.
Last edited by ele288; Mar 6th, 2023 at 16:53.
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