Ford BLIS Sensor Fault After Windshield Replacement (B1158, B1159): Complete Fix Guide

You got your windshield replaced. Now your BLIS (Blind Spot Information System) light is on and won't turn off. Or worse, your forward collision warning isn't working. You plug in a scanner and see B1158 or B1159.

This is one of the most common post-windshield-replacement issues on modern Fords — and it's almost never a broken sensor.

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What Are B1158 and B1159?

These are Ford-proprietary body codes for the BLIS radar sensors:

Code	Description
B1158	Blind Spot Monitor Sensor — Left Side Fault
B1159	Blind Spot Monitor Sensor — Right Side Fault

Despite appearing after a windshield replacement, these codes are usually not caused by the windshield itself. Your BLIS sensors are in the rear bumper fascia — not connected to the windshield.

So why are they going off?

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Why Windshield Replacement Triggers BLIS Codes

The confusion comes from the front camera and radar module mounted to the windshield. When a shop replaces your windshield, they have to:

1. Remove the IPMA (Image Processing Module A) — the forward-facing camera at the top of the windshield
2. Remove (sometimes) the FCAM module housing
3. Reinstall everything on the new glass

If the IPMA is not properly recalibrated after reinstallation, the ADAS system as a whole can throw faults — including BLIS codes, even though the physical BLIS sensors themselves are fine. The ADAS modules communicate on a shared network (HS-CAN), and a miscalibrated forward camera can cause the entire ADAS cluster to report faults.

Additionally, some shops knock the BLIS sensor brackets in the rear while working on interior trim (common when removing headliners or door panels), or they cause a brief power loss that resets module calibration offsets.

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Which Ford Models Are Affected?

Any Ford with BLIS and a windshield-mounted IPMA camera:

• F-150 (2015–present) with BLIS package
• Mustang (2019+) with Co-Pilot360
• Explorer (2016+)
• Bronco (2021+) with BLIS option
• Expedition (2018+)
• Ranger (2019+) with FordPass Connect

This is not model-specific — it's a system architecture issue that affects any Ford ADAS setup.

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Diagnosing B1158 / B1159 Properly

Step 1: Read ALL Active ADAS Codes

Don't just look at B1158/B1159 in isolation. Pull codes from:

• BCM (Body Control Module)
• IPMA (Image Processing Module)
• FCAM (Forward Camera)
• BLIS module (dedicated radar ECU)

Companion codes like C1E00 (camera blocked/obstructed), U3000 (module not communicating), or U2300 (radar not calibrated) reveal whether this is a calibration issue or hardware damage.

Most consumer OBD2 scanners only read generic OBD-II codes and won't touch the ADAS module stack. OvalCode reads B-codes and ADAS-specific codes across all Ford modules — the ones that matter for post-windshield diagnosis.

Step 2: Check Physical Installation

Before assuming software, do a visual check:

Front camera area:

• Is the IPMA bracket fully seated and not cracked?
• Is the camera positioned correctly (not tilted up or down)?
• Is the windshield heating grid (if equipped) fully connected?

Rear BLIS sensors:

• Are both rear bumper sensor housings undamaged and properly seated?
• Did the shop disconnect anything in the rear?
• Check the wiring harness routing — BLIS harnesses run near wheel wells and can chafe

Step 3: Check for IPMA Calibration Status

The IPMA requires static calibration (indoor, using a calibration target) AND in some cases dynamic calibration (driving on a straight road at highway speed). Many windshield shops — especially aftermarket glass shops — do not calibrate the IPMA.

If the IPMA is not calibrated:

• Pre-collision system will be disabled
• BLIS may fault in sympathy
• Lane-keeping and adaptive cruise may not work

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The Fixes

Fix 1: ADAS Recalibration — Required After Any Windshield Replacement

This is the correct fix for 90% of cases.

The shop that replaced your windshield should have recalibrated the IPMA as part of the job. Many shops don't — either because they don't have the equipment or because they didn't include it in the quote.

Cost: $100–250 at a dealer or calibrated glass shop. Factory scan tool required for full IPMA calibration.

Ask the glass shop: "Did you perform IPMA static and dynamic calibration?" If they look confused, that's your answer.

Fix 2: BLIS Sensor Alignment

If the BLIS sensors were physically disturbed (bumper removed, sensors repositioned), they may need angle alignment via Ford's calibration routine.

Symptoms that point here: B1158/B1159 codes specifically, BLIS warning triangle stays on, no other ADAS codes.

Cost: $80–150 at a dealer with IDS scan tool.

Fix 3: Harness Inspection and Repair

If you see companion codes like U3000 or the module shows as "Not Responding," there may be a damaged wiring harness — either from the installation or pre-existing.

Symptoms: Codes don't clear even after calibration, multiple modules not responding, BLIS intermittently works and fails.

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Can You Clear B1158/B1159 Yourself?

Clearing the code without fixing the root cause won't help — it will come back within a drive cycle.

However, reading the code yourself is valuable: it tells you exactly which module is faulting and helps you communicate with the shop. "I have B1158 stored in the BLIS module with a companion U2300 in IPMA" is a much more productive conversation with a tech than "my BLIS light is on."

OvalCode reads the full ADAS code stack — B-codes, C-codes, U-codes — across all Ford body and safety modules. This is the diagnostic layer most $30 Bluetooth scanners completely miss.

Read Your ADAS Codes with OvalCode →

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Preventing This Next Time

If you need another windshield replacement in the future:

1. Ask upfront: "Do you perform IPMA recalibration?"
2. Get it in writing as part of the job scope
3. Use a shop with certified ADAS calibration equipment — look for OEM glass + ADAS certification
4. Drive test immediately after pickup — check that BLIS, pre-collision, and lane keeping all work before leaving the lot

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Related ADAS Codes on Ford

Code	Description
B1158	BLIS Sensor Left Fault
B1159	BLIS Sensor Right Fault
C1E00	Forward Camera — Blocked/Obstructed
U2300	Forward Radar — Not Calibrated
U3000	Control Module — Not Responding
B279B	Auto Start-Stop Camera Fault

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The Bottom Line

B1158 and B1159 after a windshield replacement are almost always a calibration problem, not a broken sensor. The windshield-mounted IPMA camera needs proper static and dynamic recalibration after every glass change — and many shops skip it. Get the ADAS recalibration done, and in 90% of cases these codes clear and stay gone.

Reading your own codes before the dealer visit puts you in a much stronger position. OvalCode pulls the full ADAS module stack on Mac — including B-codes, C-codes, and U-codes that consumer scanners miss.

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