From Nissan 350Z & 370Z Wiki
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This article is part of our special
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This fix
has worked for some 350Z owners, while it has not for others.
Sometimes the CEL will stay off for a very long time, but it may
turn on again. This fix would allow you to pass inspection as long
as the light does not turn on while the inspector is in the car
=)
If you are getting a CEL (check engine light) after installing high
flow cats or test pipes, then you need this easy fix. No expensive
02 simulator is needed. They are more $ and more work than is
needed. The HELP! method is tried and proven to get rid the test
pipe related CEL.
Get two packs of HELP! Spark plug nonfoulers - part number 42002 or 42009 (either will work) - these are readily available at Autozone, Checker, Pep Boys, etc.
Drill ONLY 2 of the nonfoulers out with a 1/2" drill bit. Fit 1 NON-drilled fouler into each test pipe. Fit 1 drilled nonfouler into the previously installed undrilled fouler on each bank. Finally insert your o2 sensor into the drilled nonfouler and reconnect the wires.
THAT IS IT! Reset your ECU and the CEL will not come back!
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