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Changed all heat senors for code P420 and replaced cat. convertor what nex

Check engine light keeps coming on

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SOURCE: 1997 LINCOLN TOWN CAR - CHECK ENGINE LIGHT( code P430)

I think you will find the aftermarket Cat Conv. is the source of your problem, but without hooking up to the factory test equipment at my disposal at my Ford dealer this at best and educated guess based on 20 years of emission related work, I am a Ford certified master electronics technician

Posted on Jan 30, 2009

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P420 code


P0420 means the cat converters tests below minimum efficiency. That can be caused by an exhaust leak. Take it to a small independently owned (NOT A CHAIN PLACE) shop to get a quote.

Sep 02, 2017 | 2002 Dodge Grand Caravan

1 Answer

Replaced cat. convertor at a muffler shop cost about $150.00 and still have code P0420 and now have more codes (C1214 and C1248) and abs light, service engine light and traction light is on. Took to...


code p 0420 refers to cat converter system bank 1-efficiency below threshold ====causes --cat converter---wiring ---Heated oxygen sensor (HO2S) in the manifold before the cat converter
as the cat converter is new , that will not be an option as for the rest if the codes were not prior to the cat replacement , I would suspect wire harness problems from the cat fitment
possible to use a scan tool to reset the ECm

Dec 11, 2017 | 2002 Buick LeSabre

3 Answers

Check engine light code p420for toyota solara 2000


The "check engine" warning light advises that the vehicle is in "fail safe" mode. That means only some of the car's capabilities are operational, just enough to get you to the nearest service point. You probably should not drive it any further than that. Have your service man download and analize the fault codes from the ECM which will indicate what the problem is. The p420 code appears to indicate a probelem with your 02 sensors and maybe the catalytic convertor. The remedy may be to fit a new convertor but as these are expensive to replace, you may want to wait until the car has to pass an emissions test.

Apr 18, 2010 | Toyota Solara Cars & Trucks

1 Answer

1999 Chevy Metro 1.0 L OBDII CODE P420. NEW O2


The o2 is just reporting information,it did not mean that it was bad,there is either restriction,in the cat,or there is a contamination in the fuel,an additive might clear it up,maybe.

Jan 19, 2010 | 1999 Chevrolet Metro

4 Answers

Check Engine Light!


Yes your cat will cause it to come on...
There is a sensor before the cat that measures the emissions from your headers, then there's another sensor after your cat that measures the emissions after it passes through your cat. a faulty cat will cause the sensor to register differently triggering the light. Driving with a broken cat can cause serious damage to your engine as it also alters the backpressure

Sep 04, 2009 | 2003 Chevrolet Blazer

1 Answer

Engine light was on and engine idles rough.


these O2 sensors are cat convertor check sensors. id be checking cat convertors and hopefully you should try replacing if not all ready is the front bank 2, O2 sensor
if you have scanner can you see fuel trims in data display to confirm high fuel trim only on bank 2 either +-5 or more indicates problem and if bank 2 sensor 2 has fixed high 700mv reading cat no good(warm idling)

Jul 10, 2009 | 1998 Isuzu Rodeo

2 Answers

Codes: PO133 02, P1133 H 025, P1134 H 025


I would try to clean out the egr valve , check for leaks at the evap canister, check the evap canister soleniod , and lastly change out the cat convertor, The cat convertor is most likely under the federal emmission warranty of 8 yrs,.80000 miles. You can take the vehicle in to have checked by local dealer or call gm customer service to check the warranty on the cat. convertor by giving them your vehicle number.

Apr 18, 2009 | 2005 Pontiac Grand Prix

1 Answer

CATALYTIC CONVERTOR - BANK 2


You have a V6 engine, bank one is the row of cylinders on the passenger (right) side, bank two is the row of cylinders on the drivers side (left). Your codes indicate an inefficiency in the cat on the left side but this could be due to a bad O2 sensor or an engine that is out of tune and overloading the cat. This car seems too new to have a bad cat. I would change the plugs and the O2 sensor after the cat before going any further. The reason I say the O2 after the cat, it's the one that is critical in sensing cat efficiency. What is the mileage?

Mar 26, 2009 | 2005 Mitsubishi Galant

2 Answers

1997 LINCOLN TOWN CAR - CHECK ENGINE LIGHT( code P430)


I think you will find the aftermarket Cat Conv. is the source of your problem, but without hooking up to the factory test equipment at my disposal at my Ford dealer this at best and educated guess based on 20 years of emission related work, I am a Ford certified master electronics technician

Jan 30, 2009 | 1997 Lincoln Town Car

1 Answer

1998 CIVIC P420 CODE


the cat is bilt into manafold and the sencer is just up abuve it

Jun 19, 2008 | 1998 Honda Civic

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