C1133 on Audi
RF ABS Channel Malfunction
C1133 on Audi vehicles indicates rf abs channel malfunction. Au7o has documented this code across 1 Audi model — most commonly on S8. This is an ABS-related chassis code indicating a malfunction in the Right Front (RF) ABS hydraulic channel. Inside the ABS modulator, each channel uses solenoid valves to control brake pressure at its wheel during anti-lock events. C1133 sets when the module detects that the right front channel's valve or its circuit isn't responding correctly to commands. ABS (and often stability control) is typically disabled while standard hydraulic braking remains available. Typical repair costs on Audi range from $1,500 to $20,000, depending on the specific model and root cause.
Common Causes of C1133
- •Faulty RF ABS inlet/outlet solenoid valve in the modulator
- •Open or shorted wiring to the RF channel valve
- •Internal fault in the ABS/EBCM hydraulic control unit
- •Low system voltage affecting valve operation
- •Corroded or loose connector at the ABS module
- •Failed ABS control module (EBCM)
C1133 on Audi by Model
Audi S8(1 issue)
- Air Suspension Strut Leak and Compressor Failure2013-2022
The Audi S8 (2013-2022) uses an adaptive air suspension system with electronically controlled air struts that are prone to failure. The air springs (bellows) develop leaks from rubber deterioration, UV exposure, and road debris damage. A leaking air spring causes the affected corner of the vehicle to sag while parked, and the air compressor works overtime to compensate. This overworks the compressor, causing premature compressor failure ($2,000-$2,100 to replace). Individual air struts cost $4,300-$4,600 each to replace at a dealer. The S8's heavier curb weight (4,800+ lbs) and sport-tuned suspension put more stress on air components than the standard A8. StrutMasters and RepairPal document air suspension as one of the most expensive recurring repairs on the D4/D5 S8 platform. Complete suspension rebuild (4 struts + compressor) can exceed $20,000 at dealer pricing.
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View C1133 across all makes →Frequently Asked Questions
What does C1133 mean on Audi?▼
C1133 stands for "RF ABS Channel Malfunction." This is an ABS-related chassis code indicating a malfunction in the Right Front (RF) ABS hydraulic channel. Inside the ABS modulator, each channel uses solenoid valves to control brake pressure at its wheel during anti-lock events. C1133 sets when the module detects that the right front channel's valve or its circuit isn't responding correctly to commands. ABS (and often stability control) is typically disabled while standard hydraulic braking remains available. On Audi specifically, this code is documented across 1 model.
What causes C1133 on Audi vehicles?▼
Common causes on Audi: Faulty RF ABS inlet/outlet solenoid valve in the modulator, Open or shorted wiring to the RF channel valve, Internal fault in the ABS/EBCM hydraulic control unit, Low system voltage affecting valve operation, Corroded or loose connector at the ABS module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1133 on a Audi?▼
Repair costs on Audi range from $1,500 to $20,000, depending on the specific model and root cause.
Which Audi models have C1133 documented?▼
Au7o has documented C1133 on 1 Audi model: S8.