Question about 1998 Volvo S70

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1998 volvo failed inspection. computer said lazy o2 senser before catalytic converter. replaced it still failed. ? service light coms on when car is started.stays on for about 15 minutes then goes out.

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Hook up a scanner to the car. Might be another o2 senser.

Posted on Oct 04, 2009

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Po420


P0420 = catalyst system efficiency below threshold (bank 1)

the computer is detecting that the O2 sensor downstream of the catalytic converter on the bank of cylinders that includes cylinder 1 is starting to mirror the same cross counts as the upstream O2 sensor. This usually means that the catalytic converter is worn out and must be replaced. However, the oxygen sensors must check good---a bad or "lazy" oxygen sensor won't give an accurate picture of catalytic efficiency.

Feb 10, 2011 | 2000 Ford Focus

1 Answer

My 2000 dodge durango failed the emissions due to a bad catalytic converter... The check engine light did not come on. Could there be any other reason why it would fail?


really need more info on your durango ? millage , engine , other causes for poor emissions are weak motors , poor gas , tuneup problems and worn emission parts like lazy O2 sensors and catalytic converters

Apr 09, 2010 | 2000 Dodge Durango

1 Answer

Like bobsmith28 (Aug 22, 2009), I too get check engine light, s80


ebay for comp unit
were thyt volvo o2 sensors

Jan 01, 2010 | 2000 Volvo S80

2 Answers

Trouble codes


You mean P0420? You need a new cat converter. The "Mechanic" couldnt tell you that?

Nov 25, 2009 | 1998 Chevrolet Venture Cargo

2 Answers

I have 2002 avalanche and my engine light came on


There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.

The easiest thing to do first is a visual check of things. Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside. If any of those symptoms are there, the converter likely needs replacement. Then, visually inspect the downstream O2 sensor (behind the converter). Check for broken wires, obvious faults, etc. If all that checks out, you'll want to check the operation of the O2 sensor. To do that, you'll need access to a scan tool or oscilloscope. Check that the waveform is pretty steady. If the reading fluctuates then the sensor is likely bad and will need to be replaced.

Good luck and hope this helps.

Nov 19, 2009 | 2002 Buick Rendezvous

2 Answers

I need to replace the right bank catalytic converters. What will happen if I dont. Can I just replace them with straight pipes?


you can replace with straight pipe but if you have inspection in your state you may not pass and you may start to get o2 sensor lights on dash

Aug 25, 2009 | 1998 Ford F150 Regular Cab

2 Answers

1996 volvo 960 inspection


If you are in Texas, that car is EXEMPT from emissions. The Volvo onboard OBC II computer does NOT communicate with the machines that test for emissions. It will NEVER pass. You can spend thousands on that car and it will never pass due to the computer issue.

Apr 29, 2009 | 1996 Volvo 960

1 Answer

O2 sensor 1996 volvo fail emission test


If you have trouble codes stored in your cars computer for O2 sensors a fuse will not fix it. One or all of the O2's may need to be replaced. There are test that can be done to confirm which one.

Jan 28, 2009 | 1996 Volvo 850

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