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SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: PO 300 error codes

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Old 07-24-2019, 12:23 PM
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Sl600 & 750li
PO 300 error codes
My 1998 SL600 is showing PO 300 errors, with 304, 305 and 306 miss fires. Car has 42,000 miles and a quick c.heck of the catalytic
converter is fine. Car idles fines and runs strong. 95* day sitting in traffic with the air on and it runs fine. No misses. Where to start?....
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Old 07-25-2019, 06:10 AM
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R129 SL55 AMG & W208 CLK55 AMG
Looks like you found the OBD port after all.
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