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Volvo OBD2 Code P1171: Meaning, Causes, and Fixes for 1999 V70R Turbo Wagon

Model: Volvo Fault Code: P1171 Posted: 2006-05-22 15:27

Hi everyone, I own a 1999 Volvo V70R (all-wheel drive turbo wagon) with a 2.3-liter 5-cylinder turbo engine and am seeing OBDII diagnostic code P1171 — labeled as 'Manufacturer Specific Powertrain Trouble Code'. Can anyone clarify what this code means and what potential causes might be involved? I've seen references to lean mixtures, vacuum leaks, or issues with the Electronic Throttle Module (ETM), but I'd like a clear explanation of how these factors relate to P1171 specifically. Thanks for any insights!

Related fault codes
P1171
Comments (8)
Anonymous 2006-05-22 19:49

Could you please share the exact year, model, and engine specifications? This helps narrow down potential causes.

Anonymous 2006-05-22 22:20

It's a 1999 Volvo V70R (all-wheel drive turbo wagon), 2.3-liter 5-cylinder turbo with 247 horsepower.

Anonymous 2006-05-29 00:36

Have you identified the root cause of the P1171 code? I'm experiencing the same issue on my wife's 1999 XC wagon.

Anonymous 2006-05-29 16:04

The system is running too lean, specifically in Bank 1 during part-load conditions. There are several possible causes — have any recent modifications or repairs been done to the engine or intake system?

Anonymous 2006-05-29 20:44

I recently replaced the ABS control module due to an intermittent ABS/TRACS warning light, but the P1171 code appeared before that repair. I suspect either a vacuum leak or a Mass Airflow Sensor (MAS) issue. Could the Electronic Throttle Module (ETM) also be contributing to this problem?

Anonymous 2006-05-30 08:44

Forgive me — what exactly is the ETM? I'm not familiar with that term.

Anonymous 2006-05-30 13:30

The Electronic Throttle Module (ETM) is a 'drive-by-wire' system used in all Volvo models from 1999 onward. It's known for a relatively high failure rate, and Volvo has extended its warranty to 10 years or 100,000 miles. Given that the ETM plays a key role in fuel control, it’s one of the most likely culprits behind P1171-related lean conditions.

Anonymous 2006-05-30 16:40

Thanks — I now understand what you're referring to. Terminology differences across manufacturers can be confusing. Based on this, I’d say there’s a strong possibility the ETM is causing the issue. Given its high failure rate and long warranty coverage, it's definitely worth investigating first. Good luck with your diagnosis — please keep us updated! Jeff