High NOx in New Jersey, 93 Volvo 940 wagon - Saab Other Cars Bulletin Board - Saabnet.com
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High NOx in New Jersey, 93 Volvo 940 wagon
Posted by yaofeng [Email] (more from yaofeng) on Fri, 28 Oct 2005 06:51:26
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It is time again to go through the emissions hurdle in New Jersey with my aging fleet. The 93 Volvo 940 wagon's turn came this month. Indeed the only items failed in the State run Inspection Station yesterday was high NOx. The reading was 1,226 versus 937 allowed. CO, HC and other numbers were all within limits.
Two years ago this time I replaced the complete exhaust from the header down (with an after market cat). It did nothing to lower the high NOx, also the only item failed. In the end it was a new factory O2 sensor at about $150 that lowered the NOx reading enough to pass.
Should I plunk down another $150 for an O2 sensor to try again? Someone suggested to me the aftermarket cat needs to be replaced.
posted by 165.254....
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