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Nissan Frontier Forums : Problems / Technical

Topic: PO300 & PO400

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pecaspicaso
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Posted: Apr 11 2011 at 1:56pm \| IP Logged

Hi, I've already done some major work on this truck, change the knock sensor, and while there changed the gaskets. Getting to the knock sensor was a major task. However, my truck is still misfiring and my mechanic scanned for issues and came up with PO300 and PO400 and suggested I replace the Bank-two cat converter (front passanger side).
I'd like to know what those codes actually mean before I run off and spend another chunk!

I have a 2000 Frontier Crew Cab XE, 6 cyl. 3.3L
I'd appreciate your input!
Thanks

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La Poderosa!
2000 Frontier Crew Cab XE
6cyl, 3.3

lakota
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Posted: Apr 11 2011 at 2:59pm \| IP Logged

Welcome to the group!

please state year, model, engine and running gear!

Have a good one.. Don S..

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PLEASE >>> A SIG similar to mine can be VERY HELPFUL to all the members!
'99 4x4 3.3 Frontier Se KC Auto, 48,000 miles
'76 4x4 401 Wagoneer QT
'04 FWD 1.8 Sentra '08 FWD 2.4 Camry LE
Fort Worth

frontierguy
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Posted: Apr 11 2011 at 7:55pm \| IP Logged

P0300 is multi cyl misfire, most likely due to dirt and/or
moisture in the dist cap or plug wires shorting to ground.
Spray wires with water to check for shorts to ground. P0400
is due to EGR system, most likely valve is sticking(causing
the misfire). At any rate, you would be better off finding
a technician as opposed to a mechanic that just wants to
replace unneeded parts. And stick with Genuine Nissan parts
please!

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'10 Altima SL
Traded 08 Frontier for 16 Frontier SV CC Long box, quite an upgrade. I do miss the 6 speed and Dynomax ex.

Nissan Technician 25 + years
2011 John Deere X720SE

pecaspicaso
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Posted: Apr 11 2011 at 8:09pm \| IP Logged

Thank you so much for your expertise!

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La Poderosa!
2000 Frontier Crew Cab XE
6cyl, 3.3

jgreenjr
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Posted: Apr 12 2011 at 6:26pm \| IP Logged

I agree with frontierguy stick with Genuine Nissan frontier parts !

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Jackie

A Proud owner of
2003 Nissan Frontier XE
Have you driven Frontier lately ?
4 cyl.
4x2
auto.
KA24DE
Stereo:Kenwood KDC BT648U
Ham radio since 2001 N4MJG
Tullahoma Tenn

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