Focus 2003 zetec/lr pinging - what to check?
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I have this 2003 Focus 2.0 zetec that has a pinging problem even on 98 fuel. Changed the spark plugs. Got a knock sensor but now it turns out that maybe the Australian ones don't have them...
What else should I check? Is there anything else that could cause the issue?
Note it only happens when the engine is warmed up although there seems to be slight hesitation when cold.
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