Hello folks,

I have been doing some thinking/reflecting/reading about my recent fuel pressure job:

HELP! No Start!

AWD Fuel Pump Sending Unit - sealing around wires

http://www.brickboard.com/AWD/volvo/1362154/V70/awd_fuel_pump_comments_job_pics.html

I just read somewhere that there are a number of causes for the P0133 DTC (Volvo code EFI 435) whose code definition simply says that O2 sensor #1 is too 'slow' to respond :
- uneven compression
- air leak into intake system
- air leak into exhaust system
- incorrect fuel pressure
- defective O2 sensor (of course)

AND I had an intermittent P0133 for a few months before my fuel pump died:
recurring P0133

So I'm a little suspicious now - I think the code was caused by incorrect fuel pressure, and it was a sign of my fuel pump dying. I feel a recurring P0133 should be considered a sign of pump failure, esp with mileage of ~200k miles and/or an age of 10-12 years.

The mileage/age might be different for the FWD cars, as the AWD car actually does have a different pump.

My pump had 195k miles on it (it appears to be the original pump) and I ran into someone who did a job on another 1998 AWD and it had almost exactly the same mileage - so based on my sample size of 2 (!) I would consider 200k miles to be the expected failure interval on the AWD fuel pump. Again, it might be different for the FWD pumps.

The key here though, for me anyway, is the appearance of the recurring P0133 months ahead of time.


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1998 V70 AWD Turbo 195k+