check engine light - Mercedes-Benz Forum

 
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post #1 of 2 (permalink) Old 11-15-2008, 03:47 PM Thread Starter
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check engine light

have a 2001 clk430 with codes po170 and po173. replaced mafs. other reason is failed HO2S21. I believe this is o2 sensor but which one, i've been told there are 4 of them. Thanks
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post #2 of 2 (permalink) Old 11-15-2008, 04:13 PM
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Hi, Steve and welcome to the forum. Please take a sec to click the user cp link and complete your BW profile re vehicle and location as that is useful information.

Where did you source your MAF? E-bay is rife with replicas and they often are bad and won't get rid of your codes.

If you bought genuine Bosch from a reliable source, clear your codes and see if the H2SO2 code comes back; a bad MAF can trigger other codes. If it does come back, search for the code in the sticky, don't just rely on the text readout from the code reader.

Take care and enjoy the ride,
Greg

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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