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4-4-3 cat. efficiency. Hole in exhaust the cause?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
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alschnertz
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Year and Model: 1995 854T
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alschnertz

4-4-3 cat. efficiency. Hole in exhaust the cause?

Post by alschnertz » Sat Apr 21, 2018 2:06 pm

1995 854T; 258,000 miles

Is it possible that a hole in the muffler could set a 4-4-3 code?
There is also a leak at the front pipe / rear pipe connection.

Front O2 sensor was changed at 216,000 miles.
Rear O2 sensor was changed at 250,000 miles.

I haven't checked O2 sensor voltage readings since the car is not on the road.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

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RickHaleParker
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Re: 4-4-3 cat. efficiency. Hole in exhaust the cause?

Post by RickHaleParker » Mon Apr 23, 2018 1:20 am

Could be one of five things or a combination of two or more of the five.

1. Fuel pressure test
2. Compression test
3. Check for Intake Air leaks
4. Check for Exhaust Air leaks
5. TWC

------------------------------

28: 4-4-3 TWC efficiency. Signal faulty

DTC information 4-4-3

A2300687 Condition
The ECM continuously monitors the TWC's efficiency by comparing the signal from the rear HO2S with the signal from the front HO2S. When the TWC's efficiency deviates too much, the ECM sets DTC 4-4-3.

Substitute value
None.

Possible source
  • Uneven compression.
    Air leakage in the intake system.
    Air leakage in the exhaust system.
    Incorrect fuel pressure.
    Defective TWC.


Fault symptoms
Can result in poorer performance.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll 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.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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alschnertz
Posts: 602
Joined: Fri Apr 29, 2011 9:25 am
Year and Model: 1995 854T
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alschnertz

Re: 4-4-3 cat. efficiency. Hole in exhaust the cause?

Post by alschnertz » Mon Apr 23, 2018 2:58 pm

Thanks.
I didn't think to check compression or fuel pressure because the car has always run well.
Haven't detected any misfires by the seat of my pants.

Your info looks thorough. Where did that come from?
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

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RickHaleParker
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Re: 4-4-3 cat. efficiency. Hole in exhaust the cause?

Post by RickHaleParker » Tue Apr 24, 2018 12:39 am

Where did that come from?

Copy and paste from Volvo VIDA 2014D.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll 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.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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