Diese 5 Sensoren putzt niemand — und das kostet dich tausende Euro!

Product reviewed (implied)

The video is not reviewing a single retail product. Instead, it “reveals” five specific automotive engine sensors that are commonly blamed incorrectly by garages. It argues that many issues can be fixed by cleaning/checking them yourself, mentioning a cheap cleaner specifically for the mass airflow sensor.

Main claims: why customers get overcharged

The core message is that warning lights + generic fault codes (e.g., lean mixture codes) often lead mechanics to replace expensive parts immediately, even when the real cause is something simpler, such as:

• a dirty or failed-adjacent sensor
• a clogged channel
• a corroded connector

Typical outcomes described

• €600–€2000 bills for parts that weren’t the root cause
• “Trap” sensors where cleaning might be enough and replacement could be unnecessary

The “5 sensor” traps (unique points)

5) Lambda sensor “scam” (often not the real cause)

Feature / role

• Measures residual oxygen in the exhaust to inform fuel adjustment.
• Fault code example given: P0171 (mixed to lean).

Workshop misdiagnosis

• Mechanics treat lambda error codes as proof the sensor is defective.
• Claimed cost: €150–€250 per probe, and some cars may have up to four.

Why it’s wrong (video’s explanation)

• A lean code doesn’t automatically mean a bad lambda sensor—other issues could cause it, including a dirty mass airflow sensor.

Example anecdote (as told in the video):

• Customer paid >€400 for replacing two front lambda sensors
• After 300 km, the same code returned
• The real cause was found: mass airflow sensor was dirty
• ~15 minutes of cleaning fixed it; the new probes “were fine.”

DIY/consumer advice

Before approving lambda replacement, the video suggests asking:

• “Did you check the mass airflow sensor first?”

It also recommends using a simple OBD device to assess sensor status before going to a workshop.

Pros

• Lambda codes are presented as often being a symptom, where cleaning other parts can resolve the issue.

Cons

• No direct cons about cleaning are stated; the main “con” is replacement-only behavior by some shops.

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4) Intake manifold pressure sensor (MAP) trap

Feature / role

• The video calls it a MAP sensor.
• Measures intake manifold pressure, not direct airflow volume.
• Especially relevant for turbocharged engines (boost monitoring).
• Misreads can cause:
  • power reduction
  • higher fuel consumption
  • turbo feeling “dead”

Workshop misdiagnosis

• Error-code ranges mentioned: P016 to P0109
• Mechanics supposedly recommend a new sensor quickly.
• Claimed bill: over €500.

Hidden cause (video’s explanation)

• The sensor is connected via a tiny vacuum line/channel to the intake manifold.
• Over time, the passage clogs with hard carbon and sticky oil residue.
• The sensor may still work—the problem is the blocked pressure transmission.

DIY fix

• Use a thin wire/needle plus a short burst of compressed air to clear the small channel.
• Claimed time: < 5 minutes.
• The video claims symptoms (including jerking) and boost return disappear.

Pros

• Presented as a very fast, low-effort fix compared to replacing sensor/boost-related parts.

Cons

• Requires physical access and careful handling of the vacuum/channel path.

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3) Crankshaft sensor “panic” trap

Feature / role

• Located low on the engine block.
• Detects crank rotational position; critical for fuel injection and ignition timing.
• Without it, the engine is “practically blind.”

Failure symptoms described

• Engine cranks but won’t start
• Or:
  • starts cold
  • runs ~20 minutes
  • dies at a red light
  • won’t start for ~30 minutes
  • then returns suddenly

Workshop misdiagnosis

• Technician sees no crank signal and immediately focuses on major causes:
  • timing chain problems
  • major engine failure
• “In-depth troubleshooting” costing €500+ is implied.

Video’s real cause

• The sensor is “usually fine.”
• The problem is connector corrosion from:
  • oil mist
  • extreme temperature changes
• Corrosion causes temporary loss of signal when warm.

DIY fix

1. Unplug sensor connector
2. Clean metal contacts using contact spray
3. Apply a small amount of contact grease
4. Reconnect

The video emphasizes prevention: check the connector at least once per year in German winter (salt/moisture).

Pros

• Very cheap fix if the true issue is connector corrosion.

Cons

• Still depends on confirming that corrosion is actually the cause.

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2) Throttle position sensor misdiagnosis (feels like a dying gearbox)

Feature / role

• Near/on the throttle valve.
• Reports how far the flap is open and accelerator pedal input.
• Used by the control unit for:
  • fuel quantity
  • ignition timing
  • transmission shift points

Workshop misdiagnosis

Symptoms described:

• jerking when shifting 1st → 2nd
• power loss
• idle RPM fluctuations

Mechanics allegedly jump to:

• gearbox overhaul
• sometimes charge €250 upfront to inspect/open

Claimed expensive outcomes:

• throttle body replacement €400+
• or gearbox overhaul €2500+

Video’s real cause

After ~80,000 km, sticky black carbon deposits build up.

• The flap moves irregularly (jams → releases → jams)
• The sensor then produces erratic readings

DIY fix

• Buy a throttle body cleaner for under €10
• Clean carbon off the metal flap by hand in ~20 minutes
• Claimed success rate: solves “about 70%” of such cases
• Strong advice: clean the throttle body before any transmission work

Pros

• Low-cost, fast cleaning with a high claimed success rate.

Cons

• Deposit amounts vary; if damage is beyond carbon buildup, cleaning might not be sufficient (not explicitly stated, but implied).

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1) Mass airflow sensor (air mass meter) master trap (biggest focus)

Feature / role

• Located between the air filter and throttle valve.
• Measures how much air enters the engine.
• The control unit uses it to calculate fuel quantity.
• The video highlights extremely thin measuring threads (described as “thinner than a human hair”).

Why it fails (no warning light)

• After ~50,000–80,000 km, oil mist + dust form a microscopically thin film on the threads.
• No warning light; the sensor just slowly corrupts data.
• Result: “lean codes,” “fat codes,” and catalytic-converter-related codes.

Workshop misdiagnosis

Mechanics read codes and recommend expensive repairs (e.g., lambda sensors, injectors, intake cleaning, etc.). The video’s repeat pattern:

• car improves briefly after replacement
• rough idle returns
• eventually sensor cleaning fixes it

DIY solution (the only “product” with a specific cost)

• Buy mass airflow sensor cleaner for about €8
• Strong warning: never use brake cleaner or carburetor cleaner (the video claims they destroy the measuring threads).

Steps (as described):

1. Turn off ignition
2. Disconnect plug
3. Unscrew sensor
4. Spray directly onto threads using three short bursts
5. Don’t touch threads with swab/brush
6. Dry for ~5 minutes
7. Reinstall

Cost/Time claim

• Claims a €2000 repair can be completed in 15 minutes for €8.

Pros

• Biggest claimed ROI: very cheap cleaner, quick DIY.
• Relies on an “objective” argument: cleaning the measuring threads removes corrupted measurement data.

Cons

• Risk if the wrong cleaner is used (brake/carb cleaner allegedly damages threads).

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Comparisons / contrasts made

The video repeatedly contrasts:

• Replacing expensive parts (workshop behavior) vs.

• Cleaning/checking inexpensive sensor-related causes (DIY approach)

It also highlights possible “misidentifications,” including:

• MAP sensor confused with mass airflow sensor (the video claims some mechanics mix up the names)
• Throttle position sensor mistaken for gearbox failure

Overall pros/cons (as presented)

Pros

• Potentially prevents large repair bills (examples: €500, €600–€2000, €2500+).
• Many fixes are described as:
  • under 5 minutes (MAP channel clear)
  • ~20 minutes (throttle body cleaning)
  • ~15 minutes for MAF cleaning
• Provides concrete DIY steps and low-cost consumables (notably ~€8 MAF cleaner and <€10 throttle cleaner).

Cons

• Requires basic DIY capability and correct tools/chemicals.
• Success depends on the fault truly being caused by sensor contamination/connector/channel issues (the video argues that’s “most of the time,” but doesn’t provide independent verification).

Verdict / recommendation

Recommendation: If your car shows symptoms like rough idle, jerking, poor acceleration, or suspect mixture/boost codes, the video recommends checking/cleaning these sensor-related culprits first—especially the mass airflow sensor—before approving costly replacements. It frames this as a high-confidence way to avoid major workshop overcharges.

Speakers / perspectives

• Single main speaker/host throughout, providing:
  • workshop anecdotes
  • DIY step-by-step procedures
  • cost ranges and examples
• No other distinct speakers are present in the provided subtitles.