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96 850 Turbo- P0133, P1505, P1507

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
1997 - 2000 V70-XC
1997 - 2004 C70

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96 850 Turbo- P0133, P1505, P1507

Post by Kara503 »

Troubleshooting- Car will not enter closed loop, getting 16mpg. No driveability problems. Car pulls hard and does not smoke, idles normally.

P0133- Front o2 sensor slow response
---Already replaced the front o2 sensor with new correct spec Bosch unit, code thrown again on first drive.

P01505/P1507- Idle out of spec/ IAC signal.
---No apparent vacuum leaks, idle holds 840- 870 rpm consistently. This code appeared only AFTER I installed the new o2 sensor. A clue?

Current culprits:
-Small vacuum leak/ injector seal leak
-Bad or dirty IAC
-o2 sensor wiring fault or incorrectly connected
-Running an ECU I found at a yard labeled '96 850R'. Car was a 96 Turbo (HPT)- should match? ECU problem?

Thoughts? I'm going to smoke the intake when I am at my shop next as a first step.
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Re: 96 850 Turbo- P0133, P1505, P1507

Post by abscate »

Certainly start by returning the ECU to the correct one and seeing

The R has more boost, different injectors (?) eliminate that as a source of codes.

Remove each piece of vacuum tubing and replace any more than 5 years old to eliminate leaks - visual is ineffective.
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