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ML320 O2 sensor heater problem

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02-08-2006, 09:33 AM	#1 (permalink)
Kora BenzWorld Newbie Date registered: Feb 2006 Posts: 1	ML320 O2 sensor heater problem Hi, I have P0135 code. Changed sensors, MAF, sparkplugs. Still CEL is on. Checking voltage with ignition on on sensor heater found that Gray ground is OK, one white wire (heater) is 12V, another white (heater) wire does not show anything - must be ground. Is this a wiring problem? What pin on ECU a white (heater) wire goes to? Thank you

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