Question about 2001 Saturn L-Series

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I'm getting a PO420 engine code on my 2001 saturn L-200 2.2 liter engine. The exhaust manifold was just replaced but not the o2 sensor. Do you think it could be the o2 sensor? I understand that there are 2, o2 sensors on this vehicle. One on the Exhaust manifold and on in back, after the cat. converter. Tim lilhouse@frontiernet.net

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Hi,

IF THE CODE WAS A P0420, HAVE THE CONVERTER REPLACED WITH A GENUINE GM CONVERTER - AFTERMARKET CONVERTERS FAIL WITHIN 6 MONTHS TO A YEAR - AS FOR THE O2 SENSORS - IF THEY WEREN'T WORKING, YOU WOULD NEVER GET A CODE FOR THE CONVERTER FAILING - THEY ARE SELLING YOU PARTS YOU DON'T NEED - THE COMPUTER WILL LET YOU KNOW WHEN YOU NEED O2 SENSORS VIA A CODE - IF YOU CAN, BUY THE CONVERTER FROM GM AND HAVE IT INSTALLED BY A REPUTABLE EXHAUST SHOP.

Good Luck!!

Thanks!!

Posted on Aug 06, 2010

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I took my car to be inspected check engine light on failed inspection for codes p0030 and p0135. Where can i get it repaired with out paying a fortune. Please tell me what to do


those are both codes for the bank 1 sensor 1 O2 heater circuit. If you have a voltmeter and now how to use it I can walk you through some steps on how to check.

This O2 (on the 2.2 liter) is located on the drivers side of the exhaust manifold about where it connects to the exhaust pipe. This is not an easy O2 to replace and does require a special O2 sensor tool to remove and install a new one.

I wouldn't have any problem replacing the O2 as a first step in resolving this issue. I would check the fuses to make sure they are good first!

Aug 31, 2011 | 2006 Saturn ION

2 Answers

Enginelight on code po420


Hello: If your o2 sensors are all ok and you have no exhaust leaks the what po420 means is the catalytic converter is at or below 60 per cent efficiency. To correct the converter will have to be replaced. Check on the internet you can get one a lot cheaper than from a Lincoln dealer and it has the same warranty as the original.

Aug 18, 2011 | 2001 Lincoln Continental

2 Answers

Were are the 02 senors located on a 2001 saturn L100


This is a 4 cylinder right? Open the hood and look down between the engine and firewall, this is behind the engine. You will see the exhaust pipe, follow the exhaust pipe up to where it is bolted to the exhaust manifold. You will see the upstream O2 sensor screwed in there, more or less horizontally with wire connector pointed at driver side of car. Now get under the car and find the catalytic converter in the exhaust pipe, a big bulbous thing, the downstream O2 sensor will be after the converter, but before the muffler and will also have an electrical connection.

Aug 03, 2010 | 2001 Saturn L-Series

2 Answers

Code PO420 catalyst system efficiency below threshold


you may have a bad converter, its not cleaning the exhaust, but on the other hand a bad rear o2 sensor can also cause this problem,there is a wat to test but you would need a scan tool or scope,replace the other sensor, if light returns then replace the converter, no money lost, if you were to replace the converter the o2 sensors should also be replaced. you have 165000 miles it would be crazy not to replace sensor and install new cat, so basically your just doing it in 2 steps and may get lucky and not need a cat. good luck.

Mar 05, 2010 | 2001 Nissan Altima

1 Answer

Troubleshooting code PO420


In almost all cases, a P0420 code indicates a problem with 1 or more O2 sensors. They send incorrect emissions information back to the ECM and trigger the Check Engine Light. If the Catalytic Converter is fine (no problems with the engine hesitating or getting a lot of heat from under the car) then it's most likely the O2's.

Dec 13, 2009 | 2001 Saturn L-Series

1 Answer

Codes are Po442,PO420,PO131 and PO401.I beleive these all have to do with exhaust emission or leaks


okay po442 isevap leak check gas cap amd right front tower in engine check evap line for broken hose,po131 bad o2 sensor top sensor on rear exhaust manifold,po420 is bad catalyic converter but could be o2 sensor.i would replace o2 first reset eng lingt and go from there, hope this helps good luck.

Oct 07, 2009 | 2003 Dodge Caravan

2 Answers

Keep getting code po420



Before Checking a Catalytic
Converter DTC
Before you troubleshoot an OBD II vehicle that stores
DTC P0420 (67) (catalyst system efficiency below
threshold), run these quick checks:
1. Check for a leak in the exhaust system. If you find
one, repair it, clear the DTC, and test-drive the
vehicle.
• If the DTC returns, go to step 2.
2. Connect the PGM Tester, and test-drive the vehicle
while an assistant monitors the voltage signal from
the secondary oxygen sensor (HO2S S2). After the
catalyst reaches operating temperature, the HO2S S2
voltage should stay between 0.5 and 0.8 V at steady
cruising speed. During deceleration, the voltage
should be steady at 0.1 V or less.
• If the voltage readings are OK, clear the DTC.
• At cruising speed, if the voltage fluctuates or stays
below 5 V, go to step 3.
3. Measure the inlet and outlet external temperatures of
the catalytic converter with a thermometer capable
of reading up to 500°F.
• If the outlet temperature is more than 100°F hotter
than the inlet temperature, the converter is OK.
• If the outlet temperature is less than 100°F hotter
than the inlet temperature, replace the converter.

Aug 28, 2009 | 2001 Honda Odyssey

2 Answers

Code: P0133 - O2 Sensor Circuit Slow Response Bank 1 Sensor 1


is this a 4 or 6 cylinder?
if a 4 cylinder it will only have 2 o2 sensors
V6 will have 4 o2 senors which the sensor will be the right side of the engine first sensor.
1st sensor on exhaust, I recommend if you change one change all, as this will make the computer when it rechecks the system you have all clean/fast responding sensors.

if you have a slow response it means the sensor is dirty and not reading well, which is usually caused by minor misfires that the engine computer dismisses, so a tune up would be recommended too.

May 06, 2009 | 2001 Saturn SC

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