Automotive Q&A

Automotive Q&A Community

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AirStation
@air_station
Active Member
Joined: Jun 4, 2026
Topics: 3 / Replies: 6
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RE: Vacuum-fill hold versus positive-pressure test: what does each result actually prove?

A stable vacuum shows that the connected test boundary did not admit enough air to move the gauge during that time. It also supports an efficient fill...

4 weeks ago
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RE: What prerequisites should block a forced DPF regeneration?

Stop when soot or differential pressure is above the procedure's safe limit, oil is overfilled or fuel-diluted, required temperature or pressure senso...

1 month ago
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RE: Compressor failure: what decides whether the rest of the A/C circuit can be flushed?

First classify the failure: electrical control, seal leak, oil starvation or internal mechanical damage. Measure and photograph the recovered oil, ins...

2 months ago
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RE: Passat TDI P2002 returns even though calculated soot is low after regeneration

An independent manometer confirmed the high restriction, and ash load was beyond the service threshold. The approved DPF replacement and adaptation re...

2 months ago
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RE: CAN resistance checks: which conditions make a 60-ohm reading misleading?

State that power was off, capacitors had discharged and the exact pins and network were identified from the topology. A 60-ohm result only shows that ...

3 months ago
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RE: P0171 and P0174: fuel trims high at idle but improve at 2,500 rpm

The fact that correction is much higher at idle than at 2,500 rpm is strong evidence for an air leak whose flow becomes a smaller percentage of total ...

3 months ago