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2000 Nissan Maxima- intermittant PO 430 code

Currently has about 85K, all 3 o2 sensors have been replaced in the past 2 years, and around 6 months ago the MAF was replaced- supposedly the ecm did not need to be flashed. Now I am getting the 430 code- it stays on for around 60-100 miles and goes off for a few hundred.
does this mean cat has to be replaced? Cost is about $750 from dealer. Will any engine damage occur if I prolong the replacement?

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6 Suggested Answers

STEVIE_N_24
  • 147 Answers

SOURCE: DTC #420 on a 2004 chevy Cavalier

Need to monitor rear HO2 sensor operation. Possible bad rear O2 sensor or failed catalytic converter

Posted on Mar 29, 2009

Molson02536
  • 3854 Answers

SOURCE: O2 sensors trouble codes come back/after being replaced

What were the codes??? You should have gotten one code if it was only one O2 sensor that went bad. If all three O 2 sensor went bad you would have gotten three different codes. P0031 (bank1 sensor1) P0051 (bank2 sensor2) P0061 to P0064 O2 sensor after the catalytic. Hops this helps. 

Posted on Jul 03, 2009

  • 41 Answers

SOURCE: have a code po 430 catalyst efficiency below

You def have a catayst problem. Before changing the converter i would recommend changing both up and down stream oxygen sensor on bank 2. If they are old thats what the computer determines if the catalyst is good or not. Most of the time after changing the sensors and resetting the light the problem is solved.

Posted on Aug 26, 2009

  • 708 Answers

SOURCE: 2oo0 chevy blazer cel and code p0171 and p0174

Depending on the engine it will have between 4 and 2.

If you had a straight 4 or 6 engine then there would be only 2, one on the exhaust manifold or exhaust pipe and then one just after the catalytic converter.

If you have a "V" engine (V8, V6) then you have an oxygen sensor on each exhaust manifold and will have a catalytic converter for each bank of the V. There will also be an oxygen sensor downstream of each converter as well. In this case there would be 4 oxygen sensors.

Posted on Oct 05, 2009

  • 17 Answers

SOURCE: 2002 chevy silverado hd2500 6.0 ecm code po332 low

If all connections are good "dry, tight, no corrosion" then yes. It should be a defective sensor. These sensors are piezo sensors and create a voltage when sensing a knock. A bank refers to a side on a V style engine, 2 refers to the rear sensor on your bank 2. Bank 1 should be the side with cylinder #1 which should be the cylinder closest to you on one of the sides. So your looking for the rear sensor on the opposite side.

Posted on Jun 13, 2010

  • 613 Answers

SOURCE: have 2002 chevy avalanche 1500

sounds like a sensor is loose maybe not have good contacts?

Posted on Sep 11, 2010

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