WHAT DOES YOUR LAMBDA SENSOR DO?

The lambda sensor is a device which determines the lambda content of the exhaust gas. Since the
amount of lambda in the exhaust gas is a very good indicator of combustion efficiency, it is also the best place to monitor the air fuel ratio.

WHERE IS YOUR LAMBDA SENSOR LOCATED?

Lambda sensors are located on the exhaust pipe(s). They are screwed into
the exhaust pipe via a bung. Each car generally has 1 lambda sensor located
before and after the catalytic converter. For engines with multiple banks, there will be an lambda sensor before and after the catalytic converter in each bank.

WHY DO LAMBDA SENSORS FAIL?

Lambda sensors can fail when the sensor’s ceramic element is exposed to certain types of silicone
compounds or when an oil-burning engine leads to the sensor becoming oil-fouled. Also, a small
amount of tetra-ethyl lead in the gasoline can kill an lambda sensor. Over-the-counter fuel additives, which are not “lambda sensor safe” can also kill an lambda sensor.

HOW DO YOU KNOW YOUR LAMBDA SENSOR IS FAULTY OR FAILING?

Symptoms of a failing lambda sensor are surging, hesitation, poor overall performance, falling fuel
mileage, rough idling, a failed emissions test, and an inefficient or clogged catalytic converter.

HOW TO DIAGNOSE A FAULTY OR FAILING LAMBDA SENSOR

Oxygen sensors can be difficult to diagnose quickly. Please refer to our Oxygen Sensors 101 information booklet for detailed information on how to properly test and diagnose an lambda sensor. Ask our Customer Service Team or visit our website for more details.

WHY CHOOSE WALKER PRODUCTS LAMBDA SENSORS?

Walker Products offers the most intelligent O2 program in the industry. Now, you can rely on Walker O2s for guaranteed performance, inventory solutions, and increased category performance.

WHAT DOES YOUR IGNITION COIL DO?

The Ignition Coil takes the battery’s 12-volt output and amplifies it to over 30,000 volts. This higher
voltage is then routed to the spark plug via coil boot or wire, which ignites the air/fuel mixture inside
engine’s cylinder.

WHERE IS THE IGNITION COIL LOCATED?

The Ignition Coil is mounted either directly to the top of the spark plug or near the spark plugs. The
Ignition Coil is connected to the spark plug(s) by the coil boot or ignition wires.

WHY DOES THE IGNITION COIL FAIL?

The primary cause for failure is voltage overload caused by worn spark plugs or damaged cables
and wires. The hot and cold temperatures plus engine vibrations can cause the coil’s windings and
insulation to break.

HOW TO DIAGNOSE A FAULTY IGNITION COIL?

The vehicle could experience misfiring, backfiring, hard starting, poor performance, or poor fuel
economy - these are all potential signs of a faulty ignition coil. The vehicle’s check engine light could be triggered by a faulty ignition coil.

HOW DO YOU FIX FAULTY IGNITION COILS?

Walker Products recommends replacing all the vehicle’s ignition coils as part of the tune-up or regular maintenance. This will help prevent future ignition coil failures.

WHY SHOULD YOU CHOOSE WALKER OE IGNITION COILS?

Walker Products Ignition Coils are 100% engineered and tested. Walker Products works continuously to stay current on all OE design changes, TSB’s, and improvements to the OE design to make the best part for your vehicle. Walker Product’s Ignition Coil Sets provides the ability to fix the vehicle the first time and not make multiple trips to the store getting what you need.

HOW DO YOU KNOW YOUR IGNITION WIRE ARE FAILING?

Common signs of failing spark plug wires include a decrease in power, acceleration, and fuel efficiency. Your check engine light will come one if your engine’s computer detects an issue that could increase vehicle emissions, such as a misfire caused by a bad spark plug wire. If your engine is running poorly or experiencing rough idle, an arcing or high resistance plug wire will prevent the spark plug from firing properly. This results in incomplete combustion, causing the
engine to misfire. As a result, the car may hesitate, shudder or stall. Bad spark plug wires can increase the hydrocarbon emissions from your vehicle. This can cause it to fail a state emissions inspection. Incomplete combustion usually creates poor fuel economy. A bad spark plug wire may result in more frequent trips to the gas station and sluggish acceleration.

WHY DO IGNITION WIRES FAIL?

Vibration damage – Constant wear and tear caused by engine vibration can loosen the electrical connection at the spark plug. This causes an increase in the voltage required to fire the spark plug, which could damage the ignition coil as well as the spark plug wires.
Heat damage – Engine heat can burn wire insulation and boots. A damaged boot can impede proper spark plug wire seating and performance. Wire insulation that’s damaged by head can allow voltage to jump to the ground rather than jumping the gap at the bottom of the spark plug. Old cables may dry out, which may lead to cracks in the insulation.
Abrasion damage – When spark plug wires rub against engine parts, particularly sharp edges, it causes cuts and breaks in the insulation. Once this happens, voltage can jump to ground instead of reaching the spark plug.

WHY ARE WALKER PRODUCTS IGNITION WIRES BETTER?

• Class E Silicone / EPDM Wire Construction / SAE J2031 Rated Cable
• Operating Temperature Resistance Exceeds 450 Degrees Fahrenheit
• 500 ohm Kevlar Core, Ferrite Impregnated, Stainless Steel Wire “MAG” Wound
• Latex Silicone Layer Enhances Conductive Efficiency & Core Stability
• RFI and EMI Suppression
• EPDM Inner Insulation For Dielectric Strength
• Premium Core Provides Unmatched Strength and High Temperature Durability
• Braided Inner Tape to Provide Maximum Flexibility and Strength
• Tempered Silicone Outer Jacket
• OE Quality Terminals, Tips, Tubes
• Comes with Dielectric Grease
• EPDM Outer jacket and insulation material provides complete protection
• Kevlar core provides strength and high temperature durability
• Conductive latex enhances core stability and conductive efficiency
• Hi-Temperature Boots
• OE Quality Terminals, Tips, Tubes
• Comes with dielectric grease

WHAT DOES YOUR EXHAUST GAS TEMPERATURE SENSOR DO?

The EGTS is responsible for measuring and monitoring the temperature of exhaust gas across multiple locations in the exhaust system. In gasoline engines, if the sensor detects excessive temperatures, the ECU will reduce the temperature by lowering boost pressure. In diesel engines, the sensor is used to monitor the temperature of the diesel particulate filter (DPF) to determine the exact temperature for regeneration.

WHERE IS THE EXHAUST GAS TEMPERATURE SENSOR LOCATED?

It is common to have three or more sensors fitted to the exhaust

• T3 – pre-Turbocharger (TBC)
• T2/T4 – post Turbocharger (TBC)
• T5/T13 – post Diesel Oxidation Catalyst (DOC)
• T6 – post Diesel Particulate Filter (DPF)
• T7 – pre–Selective Catalytic Reduction (SCR)
• T8 – post Selective Catalytic Reduction (SCR)
• T9/ T11 – pre-Exhaust Gas Recirculation (EGR)
• T10/ T12 – post Exhaust Gas Recirculation (EGR)

WHY DO EXHAUST GAS TEMPERATURE SENSORS FAIL?

Exposure to excessively high temperatures, up to 900°C, over extended periods of time, is the main cause for failure. Also, damage to wires due to excessive vibrations, as well as exposure to other contaminants, fluids such as oil or antifreeze, can all affect the sensor’s functionality.

HOW DO YOU KNOW YOUR EXHAUST GAS TEMPERATURE SENSOR IS FAULTY OR
FAILING?

A faulty exhaust gas temperature sensor can negatively impact a SCR system, resulting in the
following symptoms:

• Check engine light illumination
• Reduced fuel efficiency
• Unnecessary DPF regeneration
• Failed emissions test

HOW TO DIAGNOSE A FAULTY OR FAILING EXHAUST GAS TEMPERATURE SENSOR?

• Perform an electronic test and read any fault codes using a diagnostic tool
• Inspect the connectors and wiring for signs of corrosion, breaks or loose connections
• Check the sensor for any suit build-up; remove contaminants with a clean, dry cloth

WHY ARE WALKER EXHAUST GAS TEMPERATURE SENSORS BETTER?

The Walker EGTS is an 100% OEM Based Sensor Program. Utilizing high quality metals and ceramics allows Walker sensors to deliver stable, accurate output despite heat, vibration & contamination found in the exhaust.

WHY ARE WALKER MASS AIR FLOW SENSORS BETTER? Walker Products MAF sensors are always 100% NEW and NEVER remanufactured! All sensors are 100% programmed and tested for fit, form, and function before being available to be sold. As an industry leading program, Walker Products manufacturers high demand SKUs in our USA facilities with OEM quality components, custom engineered circuit boards, and programing.

Features: • Offered in both full assembly and sensor only (where applicable) • Competitively priced against other new and remanufactured programs • All “sensor only” MAFs are supplied with the necessary security Torx° bit and corresponding security screws to aid in the removal and installation of the MAF sensor • Full Service Kits® (FSK®) - Sensor plus vehicle side mating pigtail • Industry leading program with 400+ SKUs