Question about 2002 Oldsmobile Alero

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Cat convertor low efficiency

That's what came up when the alero was hooked up to the computer to check the codes

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Sounds like cat convertor is plugged they colapse on inside bring to exhaust specialist sounds like you need a new one or a resinator

Posted on Mar 27, 2014

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Posted on Jan 02, 2017

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P0420 code on my 2003 chevy s10


CATALYST SYSTEM LOW EFFICIENCY ,MEANING THE CAT MONITOR SENSOR WAS NOT SENDING THE CORRECT SIGNAL TO THE ECM MOST LIKELY CAUSE IS A FAULTY CAT MONITOR SENSOR OR FAULTY CATALYTIC CONVERTOR.

Aug 06, 2010 | 2004 Chevrolet S-10

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2001 Olds Alero oxygen sensor bank 1 P0135


p0135 indicates bank 1 sensor 1 which is before the cat.

May 22, 2010 | 2001 Oldsmobile Alero

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Code p0420


Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1) Probably needs a catalytic converter

Apr 06, 2010 | 1999 Ford Contour

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

2 Answers

I have a 2004 jeep wrangler and i am reading the codes p0122 p0123 and p0432 can anyone let me know what these dtc's mean and if possible how to fix what it broken


P0122 - Throttle Position (TP) Sensor Circuit Low Voltage
P0123 - Throttle Position (TP) Sensor Circuit High Voltage
without checking it 1st I would guess the TPS is most likely defective.
P0432 - Catalyst System Low Efficiency Bank 2, you may have to replace the Catalytic convertor, it may be worn out,
A WORD OF CAUTION: Don't use aftermarket cats, they tend to reset the same code due to compatibility issues, also replace the cat monitor sensor (looks like an O2 sensor) located just to the rear of the bank 2 cat converter.

Dec 04, 2008 | Jeep Wrangler Cars & Trucks

4 Answers

I have 96 buick code p0420.I have replaced the converter and both 02 sensors.mil 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.

Aug 02, 2008 | Buick Regal Cars & Trucks

2 Answers

Diagnostic codes for 2003 kia sorento


hi
P0431 :- (warm up catalytic converter bank 2 - efficiency below threshold )
test the catalytic converter it locate in exhaust gas pipe
test the heated oxygen sensor in exhaust gas pipe too near the engine
P0446 :- (evaporative emission (EVAP) system , vent control , circuit malfunction )
test wiring , EVAP canister purge valve , ECM engine control module
just ask for more abut DTC

Jun 18, 2008 | 2003 Kia Sorento

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