Published: 05/10/2022

All you need to know about Yuasa AGM and EFB batteries

All you need to know about Yuasa AGM and EFB batteries

With more and more modern vehicles featuring emissions reduction technology such as start-stop, battery replacement has become more complex and time consuming.

On vehicles with start-stop technology it is essential the battery is replaced with one of the correct technology and specification. If a vehicle is fitted with an AGM Start-Stop battery then the replacement must also be an AGM Start-Stop battery, The same applies to EFB products.

Most modern vehicles come fitted with a Battery Management System (BMS) which must be reset through the on-board diagnostics (OBD) port to tell the vehicle when the battery has been replaced. Failure to fit the correct battery or reset the BMS can cause issues such as battery failure and complete loss of start-stop functionality.

On many new vehicles, the battery is not fitted under the bonnet and locating it can take time. The replacement process can also take far longer than on standard ignition vehicles, with some vehicles requiring up to an hour and a half of work.

Yuasa’s Online Battery Lookup offers a simple solution to save you time and money Yuasa Battery Lookup

It is the industry’s leading battery lookup and will identify the correct battery for the vehicle, and provide a wealth of information including battery location, estimated fitting time, reprogramming required and detailed fitting.

You can also check out the YMF range of Yuasa Batteries here - YMF Car & Van Batteries

Published: 05/10/2022

NOx Sensors Fault Diagnosis and Replacement

NOx Sensors Fault Diagnosis and Replacement

There are a number of methods used on Diesel Engines to reduce harmful emissions. One of these methods is called SCR (Selective Catalytic Reduction).

SCR is an active emissions control system where hot exhaust gases flow out of the engine and into the SCR system where aqueous urea (known as Diesel Exhaust Fluid, or DEF) is sprayed onto a special
catalyst.

Diesel Exhaust Fluid (DEF) is a non-toxic fluid composed of 32% automotive grade aqueous urea and purified water and is sometimes referred to as AdBlue.

The design of SCR technology is such that it permits nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere. It is called "selective" because it reduces levels of NOx using ammonia as a reductant within a catalyst system. The DEF is rapidly broken down to produce the oxidizing ammonia in the exhaust stream.

The chemical reaction is known as "reduction" where the DEF is the reducing agent that reacts with NOx to convert the pollutants into nitrogen, water, and tiny amounts of CO2.

The component configuration of a SCR system can vary by the vehicle manufacturer, but the fundamental principle of operation remains the same. SCR systems are often used in conjunction with
a DPF filter.

In order to inject the correct amount of DEF into the catalyst, the system employs one or two NOX Sensors. The NOx sensors are fitted before and after the SCR catalytic convertor and may be
referred to as upstream and downstream.

The NOx sensors are required to accurately measure the amount of NOx in real time and feed this information to an ECU. This information in turn allows the ECU to accurately determine how much DEF needs to be injected into the catalytic convertor to produce the lowest emission.

Published: 21/07/2022