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Old 03-02-2011, 10:34 PM   #5
Dobbie
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Re: 2003 Alero 2.2 hesitation and bad mileage

Quote:
Originally Posted by danielsatur View Post
The 4-wire H20 sensors are the same, it's usually the wire length, and connectors maybe different.

The down stream H02 sensor just tells the ECU, if the cat is good.
If the Heater go's bad , just recycle the old H20 sensor.

Did yor try cleaning the MAF, and IAT sensors with CRC MAF sensor cleaner?
The 2.2 doesn't have a MAF but what is the IAT? Is that the little sensor on the intake tubing before the TB?
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