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Eric
Eric, Automotive Repair Shop Manager
Category: Car
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Experience:  Automotive Repair Shop Manager, Technician/JA Mentor
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1999 subaru outback. blown head gasket cyl.3.

Resolved Question:

1999 subaru outback. blown head gasket cyl.3. pumps water out tail pipe. what does water do to the cat or 02 sensors. if I want to sell (smog) CA. what do I need to do? has been this way for 1 month, not run much. thanks for the help.
Submitted: 3 years ago.
Category: Car
Expert:  Eric replied 3 years ago.
Hi,

shortterm, like 1-2 weeks, this normally doesnt hurt them. Longer than that, the converter internal catalyst which is what reduces the emissions is destroyed and the O2 sensors are damaged where they either dont read at all or give inaccurate readings, which causes the computer to make the engine run either too lean or too rich as far as the fuel air ratio, which alters the emissions readings.

For it to pass, you will have to first replace the blown headgasket and second replace the converters and the O2 sensors, taking into account the length it has been this way.

Sorry to have to be the bearer of bad news, but to tell you otherwise would only frustrate you when you found out otherwise.
Eric, Automotive Repair Shop Manager
Category: Car
Satisfied Customers: 24026
Experience: Automotive Repair Shop Manager, Technician/JA Mentor
Eric and 15 other Car Specialists are ready to help you
Expert:  Eric replied 3 years ago.


short term, like 1-2 weeks, this normally doesnt hurt them. Longer than that, the converter internal catalyst which is what reduces the emissions is destroyed and the O2 sensors are damaged where they either dont read at all or give inaccurate readings, which causes the computer to make the engine run either too lean or too rich as far as the fuel air ratio, which alters the emissions readings.

For it to pass, you will have to first replace the blown headgasket and second replace the converters and the O2 sensors, taking into account the length it has been this way.

Sorry to have to be the bearer of bad news, but to tell you otherwise would only frustrate you when you found out otherwise.
Expert:  Eric replied 3 years ago.

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