99 Q45t cel codes poor mileage/driveability

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mrpeeb240
Posts: 39
Joined: Sat Oct 17, 2009 12:17 pm
Car: 99 Q45t 200k
Location: B.C Canada

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Im getting both knock sensors showing up and also leftside catalyst deficiency, I just changed plugs with proper ngk and purchased both knock sensors and both cats, my main question is should I also change my o2 sensors at same time as cats?
I do not have any 02 sensor codes but am getting horrible mileage and hesitation. 1999 Q45t 192k unknown service history
Any helps is appreciated, Brent

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Lokim
Posts: 681
Joined: Mon May 10, 2010 12:47 am
Car: 1994 Infiniti Q45 acquired 4/25/10 w/192K
Now at 222K and going strong!
Location: Seattle, WA
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MAF! Search MAF!!!
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