I recently acquired a 2005 g35 and have got a engine code 0430 i think, the catylytic converter, bank 2 code. My concern lies where my car doesnt turn over n start at all. Other threads Ive read about these 02sensor problems the users always say their car still runs. The starter works, but the engine doesnt turn over whatsoever, anyone got some advice for someone who is just starting out with infiniti (and cars in general).

 

its possible that your catalytic convertors are melted and plugging the exhaust. the o2 sensor code for the one after the cat may be popping up because it isn't getting any flow.

 

How do you know the starter works if it doesn't even crank the motor? Try turning the engine by hand it might be a seized up 300 lb paperweight, the catalytic converters are easy enough to remove and inspect. Also, a spun bearing creates a LOT of drag on the rotating assembly but the motor can still sometimes be cranked by the starter.

 

Well, i hear the starter trying to work, so its an assumption that the starter works... it at firdt didnt start. It would turn over for like half a second it would start up, the gauges (rpm and other gauges) would flip up for half a second then it would die. I got it to start the next day and took it around the block and it died not more than a half-mile away from the house, the battery was still on but the engine cut off. Now when I turn the ignition the starter sounds but it's not cranking the engine at all.

 

I just checked and the engine isnt seized. I was able to manually crank it easy... any ideas as to why the car wont start that has to do with the error code 0430?

 

Pulled this off the web for you. It is a very involved problem but I suspect a cat failure. GL with your repair and let us know the outcome.


P0430 INFINITI - Catalyst System Efficiency Below Threshold Bank 2

Possible causes

Three way catalyst converter Bank 2
Exhaust tube
Intake air leaks
Fuel injectors may be faulty
Fuel injector leaks
Spark plugs may be faulty
Improper ignition timing
Engine Control Module (ECM)
Three way catalyst converter Bank 2

What does this mean?

As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.

Read more: https://www.autocodes.com/p0430_infiniti.html


P0430 INFINITI Description

The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor). A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase. When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.

 

Ive already looked up the code, thanks for the input though... I was really just concerned because other people with this code were still able to start their car. I was wondering if its normal for it not to start with this code

 

If it doesn't crank consistently on every attempt (maybe feels sluggish or fails to crank) then I would start with removing and testing the battery and starter, clean up the cable lugs on both ends of the wire and clean the chassis to engine ground on the passenger front of the vehicle. Motor cranking is independent of all other systems and if it's not doing THAT consistently then it's the first problem that needs to be fixed.

Next, once the engine reliably cranks at full power on every attempt, if it won't START then remove and inspect the spark plugs and inspect coil packs for wear (blistering of the epoxy resin shiny part on the top, burning/scorching of the spark plug well boot, corrosion on the contact spring inside the well boot).

Next if it STILL won't start listen to the fuel pump turning on (open the gas cap, put your ear near the fuel fill nozzle while someone turns the ignition to ON (not start)) you should hear a "whirring" noise for a second or two as the pump primes the fuel line.

If that doesn't do it inspect and/or replace (since trying to find someone with an oscillator to TEST the item can be tricky) the cam and crank phase sensors, if the engine doesn't see the signal during crank from those sensors it will NOT open injectors or fire the coils.

That's the order I would tackle the issue as well.