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2019 Arteon R-Line +APR
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Subject: 2000 A4 1.8t quattro, with APR chip.
I am getting 2 codes:
• engine pinging
• fuel is lean
Car has been running fine with the APR chip for over a year and half... but this issue is new. Engine feels week... the boost is gone.
Any ideas what I should be looking at?
 
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