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Volvo S40 2.4i - O2 or Catalytic converter

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
jstar
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Volvo S40 2.4i - O2 or Catalytic converter

Post by jstar » Mon Aug 05, 2019 6:04 pm

Recently (December) we bought our very own Volvo S40 from 2007. Now with 135.000 miles on it. After a long trip of 300 miles, and then turning on the AC, we got our very own check-engine light (P0420). After some consulting on various websites, we found multiple causes. Before wasting 2k on repairs (yes that is what the Volvo dealer quoted), I would like to ask you guys for support.

We have resetted the code, and it turned on after 400-miles, and only once we were driving for a while on the highway with the AC. Typically we drive shorted drives around the city. Both cases the same code returned (P0420). Various people tell me different stories, but most boil down to the same.

Let me try to summarize my questions :) :
1. The error code only shows P0420, bank 1. This does not correlate with any of the O2 sensor. How big is the change that it is the O2 sensor? Should I just swap the convertor?
2. When I bang on the convertor, there is nothing loose in there, nor do I notice anything weird (25 mpg at this moment).
3. We tried to readout the voltage, but could only find one of the sensors. As with question one, is it possible Volvo only reads one sensor?
4. What is the advised plan of attack, as all parts are pretty expensive, I would like to prevent that I install a new part and its something else.
5. Which OBD2 reader is recommend for Volvo?



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RickHaleParker
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Re: Volvo S40 2.4i - O2 or Catalytic converter

Post by RickHaleParker » Tue Aug 06, 2019 2:32 pm

P0420 Catalyst system efficiency below threshold (Bank 1).
If you have other codes list them. There are lots of things that can trip a false P0420.

IF there are no other codes, no other problems.
Causes
1. Leak in exhaust system
2. Faulty oxygen sensor
3. Worn and internally failing catalytic converter


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
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1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

jstar
Posts: 2
Joined: Mon Aug 05, 2019 5:33 pm
Year and Model: 2007 - S40
Location: Portland
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jstar

Re: Volvo S40 2.4i - O2 or Catalytic converter

Post by jstar » Tue Aug 06, 2019 3:27 pm

The Volvo has no other codes; below you can find the read-out of the O2 sensor while running 2000 - 2200 rpm. The CAT was around 400-500 degrees Celsius (according to the sensors).

I`m wondering based on this data (as one sensor is in amp i/o voltage) if I can exclude the sensors as a problem?
Attachments
IMG_20190806_122135.jpg
IMG_20190806_122402.jpg



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