Question about 2005 Dodge Ram 1500

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  • Dodge Master
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Reset the computer and then check your EGR valve. Go to and look up consumer complaints. The code is different for the EGR, but if the ports are clogged it may affect the Catalytics.

The code is indicating bank 2 Catalytic efficiency is bad. Check out that bank. Some of the O2 sensors have vent tubes built into the connections for cooling. On these types, just hanging new wire to the O2 will not provide the venting. If the connection is bad, then the information may not get to the ECM from the new sensor.

With the problems people are having with the EGR, the ports may be restricted and although the EGR is opening, not much is flowing and it may be giving you a false 430 problem further down the exhaust system.

Posted on Nov 04, 2012

Testimonial: "Removed EGR,Pipe and PCV Valve. Pipe and PCV Valve was clogged. Poured gas thru pipe and cleaned out. Replaced EGR And PCV Valve. Reset Check engine light and drove truck all day. Code P0430 has not triggered check engine light as of yet."

  • fordexpert Nov 11, 2012

    Glad it helped


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017

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SOURCE: catalyst efficiency bank 1 below threshold

before doing anything make sure you have to code for your radio if you have the antilock radio feature!
disconnect the battery wait a few moments I can only give this info for a quick fix this will reset the computer and if it was just a glitch it should be fine after this should it reacour it is a oxygen sensor

Posted on Mar 04, 2010

  • 1071 Answers

SOURCE: I am getting a P0430 and a P0420 code on my 05

there are two more sensors and i would use chrysler sensors

Posted on Jul 21, 2009

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SOURCE: P2097 Error code in 2006 Dodge Grand Caravan, which O2 Sensor?

The one before the catalytic, on the side where cylinder # 1 is at. close to the exhaust mag.

Posted on Dec 28, 2009

  • 1165 Answers

SOURCE: installed 02 sensor 2 bank

Let's see if I got this right.The vehicle can't be driven because of legal issues with the emissions test, and it has to be driven 200 miles before it can be tested. Talk about your catch 22. Jack that thing up, put it on jack stands, fire it up, put it in gear, and watch the miles add up.

Posted on Dec 31, 2010

  • 987 Answers

SOURCE: have a 2005 dodge neon sxt, engine lite is on i

Problem seems to be the input/output wheel speed sensors.

Posted on Oct 04, 2011

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Hyundai accent catalyst inefficiency

the 02 and efficiency sensors hav issues or are sending the computer problems w the converter--may need a new one-dont buy aftamarket-original only

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I have 96 buick code p0420.I have replaced the converter and both 02 came back on code p0420. do not know what to do next, help.

fault code that is set when the Onboard Diagnostic II (OBD II) system sees a drop in converter efficiency. The OBD II system monitors catalyst efficiency by comparing the switching activity of the upstream and downstream oxygen sensors in the exhaust. The upstream O2 sensor in the exhaust manifold reflects the condition of the exhaust gases as they exit the engine. The downstream O2 sensor in or behind the catalytic converter reflects the condition of the exhaust after it passes through he converter.

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2004 chevy impala 3400 engine the cars has new head gaskets and intake gaskets and new plug wires and spark plugs heads were shaved due to over heating.since replacing all these parts the engine missis and...

It's look to me . fuel are going in catalyst converter by one or more cylinder not firing. that's why the catalyst converter going red it's like a stove that burn fuel.and air.

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Code p431 and p421

P421=Warm up catalyst system efficiency below threshold, bank 1
P431=Warm up catalyst system efficiency below threshold, bank 2
Sounds like you may have clogged or damaged catalyst converters or bad 02 sensors.
Those codes I think are taking from after the catalyst by the sensors in the exhaust pipes. Be careful taking it to a mechanic for further checking since the catalyst converters are not cheap through them. If you need to replace the converters, shop around and get prices on aftermarket parts. Don't be ripped off by a hungry mechanic or especially a dealer.

Aug 17, 2013 | 2006 Mitsubishi Eclipse

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Iput a new alarm sistem on my 2005 odyssey and chek engine light came on, code p 0420

P0420 = catalyst efficiency below threshold (bank 1)

I think it is a coincidence that the check engine light came on with this code at the same time as you installed the new alarm.

the power train control module or computer checks the output of the oxygen sensors (pre-catalyst and post-catalyst) and compares them. When the post-catalyst sensor output starts to resemble the pre-catalyst sensor output with little difference, the computer sets the catalyst efficiency code. Check the output of the oxygen sensors. A worn out or lazy oxygen sensor might be at fault. If the sensors check okay, then the catalytic converter may need to be replaced. This is unusual for a 2005 unless the engine has been having misfires. Raw unburned fuel will quickly destroy a catalytic converter.

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Where is an "02 sensor heater circuit bank 1

the O2 bank 1 sensor 2 its located on the passenger side after the catalyst converter, you will see two sensors in this side of the exhaust its the second sensor

Feb 10, 2011 | Ford E-150 Cars & Trucks

1 Answer

Check engine light on. took the car to auto zone to put it on a scanner. trouble code p0420. catalyst system efficiency below threshold. probable cause; large vaccum leak, fuel system fault, ignition...

Diagnostic code produces P0420 catalyst system efficiency below threshold-Bank 1. Probable causes are listed as follows:
1-air leak in exhaust before rear 02 sensor, 3-Fuel system fault,
4-faulty catalytic converter.

May 31, 2010 | 2001 Nissan Altima

1 Answer


17584/P1176/004470 - Bank1: O2 (Lambda) Correction Behind Catalyst: Control Limit Reached Possible Causes
  • Intake Air System leaking
  • Oxygen Sensor(s) and/or Oxygen Sensor Control faulty
Possible Solutions
  • Check Intake Air System for Leaks (False Air)
  • Check Oxygen Sensor(s) and/or Oxygen Sensor Control (all of them!)
This is the pre 02 sensor located before the catalytic converter.

May 10, 2010 | 2000 Volkswagen Jetta TDI

2 Answers

Jeep 2008 Commander 5.7 code p0430 What does this code mean? Thanks,

code --catalyst system efficiency below threshold bank 2 -means that the o2 sensor [bank 2 and after cat converter] is detecting that the converter in not working efficiently as it should as per specs--check the 02 sensor --if good possible exhaust leak if good --possible cat converter gone bad and since it is an 08 cat should be covered under warranty check with a dealer most converters are covered for five years doesnt matter how many miles on vehicle

Mar 30, 2010 | 2008 Jeep Commander

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Check engine light on PO420 code ? recalls

Huge problems with these cars. The Pre-cat converter is built into the exhaust manifold. Expensive to replace. No Recall on this item. Some say that inferior compounds in the catalyst cause corrosion and early wear of the piston rings. I have seen one of these use 5 qts of oil in 300 miles. Is this car using excess oil?

Jan 16, 2010 | 2005 Nissan Altima

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