C1714 on Lexus: How to Diagnose & Fix
C1714 — Lexus-specific definition
2 Lexus models · 2 documented issues · 2 critical · $1,500-$6,000 repair
C1714 on Lexus by model: symptoms, diagnosis and fix
The pneumatic air suspension system on the LS460 and LS600h develops leaks in the air springs, causing the vehicle to sag overnight or drop on one corner. The air compressor runs excessively to compensate for leaks and eventually burns out. Complete air suspension failure leaves the car sitting on the bump stops.
Common Symptoms
- Vehicle sags on one corner overnight
- Compressor runs constantly or excessively
- Suspension warning light on dashboard
- Rough ride quality with bottoming out
- Vehicle sits noticeably lower than normal
How to Fix
Replace failed air struts with new OEM or aftermarket units from Arnott or Suncore. Replace the compressor if it no longer maintains pressure. For a permanent fix, some owners convert to conventional coilover suspension using kits from Strutmasters or BC Racing, which eliminates future air suspension issues.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Arnott P-3188 OES air-suspension compressorOEMP-3188
Replace a test-confirmed failed compressor only after repairing system leaks Fitment/availability: Live in-stock Add to Cart page identifies P-3188 and lists 2007-2017 LS460 RWD/AWD fitments; Arnott's application manual adds 2008-2016 LS…
- Arnott AS-2855 front air strutOEMAS-2855
Replace a confirmed leaking or failed front air strut on the RWD LS460 branch Fitment/availability: Live in-stock Add to Cart page identifies AS-2855 and front 2007-2017 LS460 RWD fitment for USF40 short- and USF41 long-wheelbase applica…
- Arnott AS-2856 rear air strutOEMAS-2856 / retailer 75-23697-AI
Replace a confirmed leaking or failed rear air strut on the earlier AVS-equipped branch Fitment/availability: Live low-inventory Add to Cart page identifies Arnott AS-2856; Arnott's catalog specifies rear left or right for 2007-2012 LS46…
- Arnott C-3418 complete air-to-coil conversion kitOEMC-3418
Provide a disclosed full-system passive conversion option for the exact RWD LS460 branch Fitment/availability: Live Add to Cart page identifies C-3418, 2007-2017 LS460 XF40 RWD only, all-new OE-equivalent struts and electronic bypass mod…
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Sources for this issue (4)
The Active Height Control hydraulic suspension on the LX570 develops leaks in the height control actuators, accumulator, and hydraulic lines. The system uses hydraulic fluid under high pressure to adjust ride height, and seals deteriorate over time causing fluid loss. A complete system failure leaves the vehicle stuck at one height setting and triggers warning lights.
Common Symptoms
- Vehicle sits lower than normal on one or more corners
- AHC warning light illuminated
- Height control switch no longer adjusts ride height
- Hydraulic fluid leak visible under vehicle
- Ride becomes harsh or bouncy
How to Fix
Replace failed AHC components — actuators, accumulator, or hydraulic lines as needed. A complete AHC overhaul runs $3,000-$6,000 at the dealer. Alternatively, convert to a conventional spring suspension using aftermarket kits that eliminate all hydraulic components.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- 49141-60020 genuine Lexus front AHC accumulatorOEM49141-60020
Replace a pressure-test-confirmed failed front accumulator Fitment/availability: Live Add to Cart page explicitly lists 2008-2021 LX570 fitment. The catalog uses this front accumulator on both left and right; confirm VIN and quantity for…
- 49151-60020 genuine Lexus rear AHC accumulatorOEM49151-60020
Replace a pressure-test-confirmed failed rear accumulator Fitment/availability: Live Add to Cart page explicitly lists 2008-2021 LX570 fitment. The catalog uses this rear accumulator on both left and right; confirm VIN and quantity for t…
- 48010-60010 genuine Lexus front-right shock-control valve assemblyOEM48010-60010
Position-specific; confirm VIN and failure before ordering.
- 48020-60010 genuine Lexus front-left shock-control valve assemblyOEM48020-60010
Position-specific; confirm VIN and failure before ordering.
- 48030-60010 genuine Lexus rear-right shock-control valve assemblyOEM48030-60010
Position-specific; confirm VIN and failure before ordering.
- 48040-60010 genuine Lexus rear-left shock-control valve assemblyOEM48040-60010
Position-specific; confirm VIN and failure before ordering.
- 48910-60033 genuine Lexus AHC pump-and-motor assemblyOEM48910-60033 (replaces 48910-60030, 48910-60031 and 48910-600
Replace a pressure- and electrical-test-confirmed failed height-control pump Fitment/availability: Live Add to Cart page explicitly lists 2008-2021 LX570 fitment and supersedes 48910-60030, -60031 and -60032.
- 48940-60020 genuine Lexus No. 1 height-control valve assemblyOEM48940-60020
Confirm VIN, hydraulic diagnosis and all required union seals before ordering.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipBudget for AHC maintenance on any LX570 over 80,000 miles. The system is shared with the Toyota Land Cruiser 200, so LC forums have extensive repair documentation that applies directly.
Sources for this issue (3)
C1714 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1714 mean on a Lexus?
On Lexus, C1714: On Lexus air and height-control suspensions (Toyota/Lexus service information for the LS430 and GX470, for example), C1714 is the Left Rear Height Control Sensor Circuit code: an open or short in the rear LH height control sensor circuit. The trouble areas are the rear LH height control sensor, its wiring and the suspension control ECU, and vehicle height control is suspended while the code is stored. Sources: https://www.clublexus.com/forums/attachments/gx-1st-gen-2004-2009/317928d1393947127-air-ride-diagram-05-477-height-control-codes.pdf ; https://manuals.autorepairshq.com/Lexus/2004/LS%20430%20V8-4.3L%20%283UZ-FE%29/Repair%20and%20Diagnosis/A%20L%20L%20%20Diagnostic%20Trouble%20Codes%20%28%20DTC%20%29/Testing%20and%20Inspection/C%20Code%20Charts/C1714 On Lexus it is documented across 2 models: LS, LX.
How much does it cost to fix C1714 on a Lexus?
Published repair estimates on Lexus range from $1,500 to $6,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.